# Stark Infra Elixir SDK Beta

Welcome to the Stark Infra Elixir SDK! This tool is made for Elixir
developers who want to easily integrate with our API.
This SDK version is compatible with the Stark Infra API v2.

# Introduction

# Index

- [Introduction](#introduction)
  - [Supported Elixir versions](#supported-elixir-versions)
  - [API documentation](#stark-bank-api-documentation)
  - [Versioning](#versioning)
- [Setup](#setup)
  - [Install our SDK](#1-install-our-sdk)
  - [Create your Private and Public Keys](#2-create-your-private-and-public-keys)
  - [Register your user credentials](#3-register-your-user-credentials)
  - [Setting up the user](#4-setting-up-the-user)
  - [Setting up the error language](#5-setting-up-the-error-language)
  - [Resource listing and manual pagination](#6-resource-listing-and-manual-pagination)
- [Testing in Sandbox](#testing-in-sandbox) 
- [Usage](#usage)
   - [Issuing](#issuing)
    - [BINs](#query-issuingbins): View available sub-issuer BINs (a.k.a. card number ranges)
    - [Holders](#create-issuingholders): Manage card holders
    - [Cards](#create-issuingcards): Create virtual and/or physical cards
    - [Purchases](#process-purchase-authorizations): Authorize and view your past purchases
    - [Invoices](#create-issuinginvoices): Add money to your issuing balance
    - [Withdrawals](#create-issuingwithdrawals): Send money back to your Workspace from your issuing balance
    - [Balance](#get-your-issuingbalance): View your issuing balance
    - [Transactions](#query-issuingtransactions): View the transactions that have affected your issuing balance
  - [Pix](#pix)
    - [PixRequests](#create-pixrequests): Create Pix transactions
    - [PixReversals](#create-pixreversals): Reverse Pix transactions
    - [PixBalance](#get-your-pixbalance): View your account balance
    - [PixStatement](#create-a-pixstatement): Request your account statement
    - [PixKey](#create-a-pixkey): Create a Pix Key
    - [PixClaim](#create-a-pixclaim): Claim a Pix Key
    - [PixDirector](#create-a-pixdirector): Create a Pix Director
    - [PixInfraction](#create-pixinfractions): Create Pix Infraction reports
    - [PixChargeback](#create-pixchargebacks): Create Pix Chargeback requests
    - [PixDomain](#query-pixdomains): View registered SPI participants certificates
  - [Credit Note](#credit-note)
    - [CreditNote](#create-creditnotes): Create credit notes
  - [Webhook](#webhook):
    - [Webhook](#create-a-webhook-subscription): Configure your webhook endpoints and subscriptions
  - [Webhook Events](#webhook-events):
    - [WebhookEvents](#process-webhook-events): Manage Webhook events
    - [WebhookEventAttempts](#query-failed-webhook-event-delivery-attempts-information): Query failed webhook event deliveries
- [Handling errors](#handling-errors)
- [Help and Feedback](#help-and-feedback)

# Supported Elixir Versions

This library supports Elixir versions 1.9+.

# Stark Infra API documentation

Feel free to take a look at our [API docs](https://www.starkbank.com/docs/api).

# Versioning

This project adheres to the following versioning pattern:

Given a version number MAJOR.MINOR.PATCH, increment:

- MAJOR version when the **API** version is incremented. This may include backwards incompatible changes;
- MINOR version when **breaking changes** are introduced OR **new functionalities** are added in a backwards compatible manner;
- PATCH version when backwards compatible bug **fixes** are implemented.

# Setup

## 1. Install our SDK

To install the package with mix, add this to your deps and run `mix deps.get`:

```elixir
def deps do
  [
  {:starkinfra, "~> 0.1.0"}
  ]
end
```

## 2. Create your Private and Public Keys

We use ECDSA. That means you need to generate a secp256k1 private
key to sign your requests to our API, and register your public key
with us so we can validate those requests.

You can use one of following methods:

2.1. Check out the options in our [tutorial](https://starkbank.com/faq/how-to-create-ecdsa-keys).

2.2. Use our SDK:

```elixir
{private_key, public_key} = StarkInfra.Key.create()

# or, to also save .pem files in a specific path
{private_key, public_key} = StarkInfra.Key.create("file/keys/")
```

**Note**: When you are creating a new Project, it is recommended that you create the
keys inside the infrastructure that will use it, in order to avoid risky internet
transmissions of your **private-key**. Then you can export the **public-key** alone to the
computer where it will be used in the new Project creation.

## 3. Register your user credentials

You can interact directly with our API using two types of users: Projects and Organizations.

- **Projects** are workspace-specific users, that is, they are bound to the workspaces they are created in.
One workspace can have multiple Projects.
- **Organizations** are general users that control your entire organization.
They can control all your Workspaces and even create new ones. The Organization is bound to your company's tax ID only.
Since this user is unique in your entire organization, only one credential can be linked to it.

3.1. To create a Project in Sandbox:

3.1.1. Log into [StarkInfra Sandbox](https://web.sandbox.starkinfra.com)

3.1.2. Go to Menu > Integrations

3.1.3. Click on the "New Project" button

3.1.4. Create a Project: Give it a name and upload the public key you created in section 2

3.1.5. After creating the Project, get its Project ID

3.1.6. Use the Project ID and private key to create the struct below:

```elixir
# Get your private key from an environment variable or an encrypted database.
# This is only an example of a private key content. You should use your own key.
private_key_content = "
-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIMCwW74H6egQkTiz87WDvLNm7fK/cA+ctA2vg/bbHx3woAcGBSuBBAAK
oUQDQgAE0iaeEHEgr3oTbCfh8U2L+r7zoaeOX964xaAnND5jATGpD/tHec6Oe9U1
IF16ZoTVt1FzZ8WkYQ3XomRD4HS13A==
-----END EC PRIVATE KEY-----
"

project = StarkInfra.project(
  id: "5671398416568321",
  environment: :sandbox,
  private_key: private_key_content
)
```

3.2. To create Organization credentials in Sandbox:

3.2.1. Log into [Starkinfra Sandbox](https://web.sandbox.starkinfra.com)

3.2.2. Go to Menu > Integrations

3.2.3. Click on the "Organization public key" button

3.2.4. Upload the public key you created in section 2 (only a legal representative of the organization can upload the public key)

3.2.5. Click on your profile picture and then on the "Organization" menu to get the Organization ID

3.2.6. Use the Organization ID and private key to create the struct below:

```elixir
# Get your private key from an environment variable or an encrypted database.
# This is only an example of a private key content. You should use your own key.
private_key_content = """
-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIMCwW74H6egQkTiz87WDvLNm7fK/cA+ctA2vg/bbHx3woAcGBSuBBAAK
oUQDQgAE0iaeEHEgr3oTbCfh8U2L+r7zoaeOX964xaAnND5jATGpD/tHec6Oe9U1
IF16ZoTVt1FzZ8WkYQ3XomRD4HS13A==
-----END EC PRIVATE KEY-----
"""

organization = StarkInfra.Organization(
  environment: "sandbox",
  id: "5656565656565656",
  private_key: private_key_content,
  workspace_id: nil,  # You only need to set the workspace_id when you are operating a specific workspace_id
)
```

NOTE 1: Never hard-code your private key. Get it from an environment variable or an encrypted database.

NOTE 2: We support `'sandbox'` and `'production'` as environments.

NOTE 3: The credentials you registered in `sandbox` do not exist in `production` and vice versa.

## 4. Setting up the user

There are three kinds of users that can access our API: **Organization**, **Project** and **Member**.

- `Project` and `Organization` are designed for integrations and are the ones meant for our SDKs.
- `Member` is the one you use when you log into our webpage with your e-mail.

There are two ways to inform the user to the SDK:
 
4.1 Passing the user as argument in all functions using the `user` keyword:

```elixir
balance = StarkInfra.PixBalance.get!(user: project)  # or organization
```

4.2 Set it as a default user in the `config/config.exs` file:

```elixir
import Config

config :starkinfra,
  project: [
    environment: :sandbox,
    id: "9999999999999999",
    private_key: private_key_content
  ]
```

or

```elixir
import Config

config :starkinfra,
  organization: [
    environment: :sandbox,
    id: "9999999999999999",
    private_key: private_key_content,
    workspace_id: "8888888888888888" # or nil
  ]
```

Just select the way of passing the user that is more convenient to you.
On all following examples we will assume a default user has been set in the configs.

## 5. Setting up the error language

The error language can also be set in the `config/config.exs` file:

```elixir
import Config

config :starkinfra,
  language: "en-US"
```

Language options are "en-US" for english and "pt-BR" for brazilian portuguese. English is default

## 6. Resource listing and manual pagination

Almost all SDK resources provide a `query` and a `page` function.

- The `query` function provides a straight forward way to efficiently iterate through all results that match the filters you inform,
seamlessly retrieving the next batch of elements from the API only when you reach the end of the current batch.
If you are not worried about data volume or processing time, this is the way to go.

```elixir
notes = StarkInfra.CreditNote.query!(
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
) 
|> Enum.take(10) 
|> IO.inspect
```

- The `page` function gives you full control over the API pagination. With each function call, you receive up to
100 results and the cursor to retrieve the next batch of elements. This allows you to stop your queries and
pick up from where you left off whenever it is convenient. When there are no more elements to be retrieved, the returned cursor will be `nil`.

```elixir
defmodule CursorRecursion do
  def get!(iterations \\ 1, cursor \\ nil)  

  def get!(iterations, cursor) when iterations > 0 do
  {new_cursor, new_entities} = StarkInfra.CreditNote.page!(cursor: cursor)
  new_entities ++ get!(
    iterations - 1,
    new_cursor
  )
  end

  def get!(iterations, _cursor) do
    []
  end
end

transactions = CursorRecursion.get!(3) 
|> IO.inspect
```

To simplify the following SDK examples, we will only use the `query` function, but feel free to use `page` instead.

# Testing in Sandbox

Your initial balance is zero. For many operations in Stark Infra, you'll need funds
in your account, which can be added to your balance by creating an StarkBank.Invoice 
or a StarkBank.Boleto. 

In the Sandbox environment, most of the created Invoices and Boletos will be automatically paid,
so there's nothing else you need to do to add funds to your account. Just create
a few Invoices and wait around a bit.

In Production, you (or one of your clients) will need to actually pay this Invoice or Boleto
for the value to be credited to your account.

# Usage

Here are a few examples on how to use the SDK.

Here are a few examples on how to use the SDK. If you have any doubts, use the built-in
`h()` function to get more info on the desired functionality
(for example: `StarkInfra.CreditNote |> h`)

**Note**: Almost all SDK functions also provide a bang (!) version. To simplify the examples, they will be used the most throughout this README.

## Issuing

### Query IssuingBins

To take a look at the sub-issuer BINs available to you, just run the following:

```elixir
StarkInfra.IssuingBin.query!() 
|> Enum.take(10) 
|> IO.inspect
```

This will tell which card products and card number prefixes you have at your disposal.

### Create IssuingHolders

You can create card holders to which your cards will be bound.
They support spending rules that will apply to all underlying cards.

```elixir
StarkInfra.IssuingHolder.create!([
  %StarkInfra.IssuingHolder{
    name: "Iron Bank S.A.",
    taxId: "012.345.678-90"
    external_id: "1234",
    tags: ["Traveler Employee"],
    rules: [
      %StarkInfra.IssuingRule{
        name: "General USD",
        interval: "day"
        amount: "100000",
        currencyCode: "USD"
      }
    ]
  }
]) |> IO.inspect
```

**Note**: Instead of using IssuingHolder structs, you can also pass each transfer element in dictionary format

### Query IssuingHolders

You can query multiple holders according to filters.

```elixir
StarkInfra.IssuingHolder.query!() 
|> Enum.take(10) 
|> IO.inspect
```

### Cancel an IssuingHolder

To cancel a single Issuing Holder by its id, run:

```elixir
StarkInfra.IssuingHolder.cancel!("5155165527080960") 
|> IO.inspect
```

### Get an IssuingHolder

To get a single Issuing Holder by its id, run:

```elixir
StarkInfra.IssuingHolder.get!("5155165527080960") 
|> IO.inspect
```

### Query IssuingHolder logs

You can query holder logs to better understand holder life cycles.

```elixir
StarkInfra.IssuingHolder.Log.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
)
|> Enum.take(10) 
|> IO.inspect
```

### Get an IssuingHolder log

You can also get a specific log by its id.

```elixir
StarkInfra.IssuingHolder.Log.get!("5155165527080960")
|> IO.inspect
```

### Create IssuingCards

You can issue cards with specific spending rules.

```elixir
StarkInfra.IssuingCard.create!([
  %StarkInfra.IssuingCard{
    holder_name: "Developers",
    holder_tax_id: "012.345.678-90"
    holder_external_id: "1234",
    rules: [
      %StarkInfra.IssuingRule{
        name: "General",
        interval: "week"
        amount: "100000",
        currencyCode: "USD"
      }
    ]
  }
]) |> IO.inspect
```

### Query IssuingCards

You can get a list of created cards given some filters.

```elixir
StarkInfra.IssuingCard.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
) 
|> Enum.take(10)
|> IO.inspect
```

### Get an IssuingCard

After its creation, information on a card may be retrieved by its id.

```elixir
StarkInfra.IssuingCard.get!("5155165527080960") 
|> IO.inspect
```

### Update an IssuingCard

You can update a specific card by its id.

```elixir
StarkInfra.IssuingCard.update!(
  "5155165527080960", 
  status: "blocked"
) |> IO.inspect
```

### Cancel an IssuingCard

You can also cancel a card by its id.

```elixir
StarkInfra.IssuingCard.cancel!("5155165527080960")
|> IO.inspect
```

### Query IssuingCard logs

Logs are pretty important to understand the life cycle of a card.

```elixir
StarkInfra.IssuingCard.Log.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get an IssuingCard log

You can get a single log by its id.

```elixir
StarkInfra.IssuingCard.Log.get!("5155165527080960") 
|> IO.inspect
```

### Process Purchase authorizations

It's easy to process purchase authorizations delivered to your endpoint.
If you do not approve or decline the authorization within 2 seconds, the authorization will be denied.

```elixir
request = listen()  # this is the method you made to get the events posted to your webhook

{authorization, _cache_pid} = StarkInfra.IssuingAuthorization.parse!(
  content: request.content,
  signature: request.headers["Digital-Signature"]
)

send_response(  # you should also implement this method
  StarkInfra.IssuingAuthorization.response!(
      "accepted",
      amount: authorization.amount,
      tags: ["my-purchase-id/123"]
  )
)

# or

send_response(
  StarkInfra.IssuingAuthorization.response!(
      "denied",
      reason: "other",
      tags: ["other-id/456"]
  )
)
```

### Query IssuingPurchases

You can get a list of created purchases given some filters.

```elixir
StarkInfra.IssuingPurchase.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
) 
|> Enum.take(10)
|> IO.inspect
```

### Get an IssuingPurchase

After its creation, information on a purchase may be retrieved by its id. 

```elixir
StarkInfra.IssuingPurchase.get!("5155165527080960") 
|> IO.inspect
```

### Query IssuingPurchase logs

Logs are pretty important to understand the life cycle of a purchase.

```elixir
StarkInfra.IssuingPurchase.Log.query!(
  limit: 50,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
) 
|> Enum.take(50) 
|> IO.inspect
```

### Get an IssuingPurchase log

You can get a single log by its id.

```elixir
StarkInfra.IssuingPurchase.Log.get!("5155165527080960") 
|> IO.inspect
```

### Create IssuingInvoices

Issuing invoices are requests to transfer money to your Issuing Balance. When an Issuing Invoice you created is paid, the amount will be added to your Issuing Balance.

```elixir
StarkInfra.IssuingInvoice.create!([
  %StarkInfra.IssuingInvoice{
    amount: 1000
  }
]) |> IO.inspect
```

**Note**: Instead of using Invoice structs, you can also pass each invoice element in dictionary format

### Get an IssuingInvoice

After its creation, information on an invoice may be retrieved by its id. 
Its status indicates whether it's been paid.

```elixir
StarkInfra.IssuingInvoice.get!("5155165527080960") 
|> IO.inspect
```

### Query IssuingInvoices

You can get a list of created invoices given some filters.

```elixir
StarkInfra.IssuingInvoice.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
) 
|> Enum.take(10) 
|> IO.inspect
```

### Query IssuingInvoice logs

Logs are pretty important to understand the life cycle of an invoice.

```elixir
StarkInfra.IssuingInvoice.Log.query!(
  limit: 50,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get an IssuingInvoice log

You can get a single log by its id.

```elixir
StarkInfra.IssuingInvoice.Log.get!("5155165527080960") 
|> IO.inspect
```

### Create IssuingWithdrawals

You can create withdrawals to send cash back from your Issuing balance to your Banking balance
by using the Withdrawal resource.

```elixir
StarkInfra.IssuingWithdrawal.create!(
  %StarkInfra.IssuingWithdrawal{
    amount: 10000,
    external_id: "123"
    description: "Sending back",
  }
) |> IO.inspect
```

**Note**: Instead of using Withdrawal structs, you can also pass each withdrawal element in dictionary format

### Get an IssuingWithdrawal

After its creation, information on a withdrawal may be retrieved by its id.

```elixir
StarkInfra.IssuingWithdrawal.get!("5155165527080960") 
|> IO.inspect
```

### Query IssuingWithdrawals

You can get a list of created invoices given some filters.

```elixir
StarkInfra.IssuingWithdrawal.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get your IssuingBalance

To know how much money you have available to run authorizations, run:

```elixir
StarkInfra.IssuingBalance.get!() 
|> IO.inspect
```

### Query IssuingTransactions

To understand your balance changes (issuing statement), you can query
transactions. Note that our system creates transactions for you when
you make purchases, withdrawals, receive issuing invoice payments, for example.

```elixir
StarkInfra.IssuingTransaction.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get an IssuingTransaction

You can get a specific transaction by its id:

```elixir
StarkInfra.IssuingTransaction.get!("5155165527080960") 
|> IO.inspect
```

## Pix

### Create PixRequests

You can create a Pix request to transfer money from one of your users to anyone else:

```elixir
StarkInfra.PixRequest.create!([
  %StarkInfra.PixRequest{
    amount: 100,
    external_id: "141234121",
    sender_account_number: "00000-0",
    sender_branch_code: "0001",
    sender_account_type: "checking",
    sender_name: "Tyrion Lannister",
    sender_tax_id: "012.345.678-90",
    receiver_bank_code: "00000001",
    receiver_account_number: "00000-0",
    receiver_branch_code: "0001",
    receiver_account_type: "checking",
    receiver_name: "Jamie Lannister",
    receiver_tax_id: "012.345.678-90",
    end_to_end_id: StarkInfra.Utils.EndToEndId.generate("00000001") # Pass your bank code to create an end to end ID
  }
]) |> IO.inspect
```

**Note**: Instead of using PixRequest structs, you can also pass each element in dictionary format

### Query PixRequests

You can query multiple Pix requests according to filters.

```elixir
StarkInfra.PixRequest.query!(
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  status: ["success"],
  tags: ["iron", "suit"],
  end_to_end_ids: ["E79457883202101262140HHX553UPqeq"]
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get a PixRequest

After its creation, information on a Pix request may be retrieved by its id. Its status indicates whether it has been paid.

```elixir
StarkInfra.PixRequest.get!("5155165527080960") 
|> IO.inspect
```

### Query PixRequest logs

You can query Pix request logs to better understand Pix request life cycles. 

```elixir
logs = StarkInfra.PixRequest.Log.query!(
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
) 
|> Enum.take(10)
|> IO.inspect
```

### Get a PixRequest log

You can also get a specific log by its id.

```elixir
StarkInfra.PixRequest.Log.get!("5155165527080960") |> IO.inspect
```

### Create PixReversals

You can reverse a PixRequest either partially or totally using a PixReversal.

```elixir
StarkInfra.PixReversal.create!([
  %StarkInfra.PixReversal{
    amount: 100,
    external_id: "my_unique_id",
    end_to_end_id: "E00000000202201060100rzsJzG9PzMg",
  }
]) |> IO.inspect
```

### Query PixReversals 

You can query multiple Pix reversals according to filters. 

```elixir
StarkInfra.PixReversal.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  status: ["created"],
  tags: ["iron", "suit"],
  return_ids: ["D20018183202202030109X3OoBHG74wo"]
) 
|> Enum.take(10) 
|> IO.inspect
```

### Get a PixReversal

After its creation, information on a Pix reversal may be retrieved by its id.
Its status indicates whether it has been successfully processed.

```elixir
StarkInfra.PixReversal.get!("5155165527080960") 
|> IO.inspect
```

### Query PixReversal logs

You can query Pix reversal logs to better understand their life cycles. 

```elixir
StarkInfra.PixReversal.Log.query!(
  limit: 50,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1)
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixReversal log

You can also get a specific log by its id.

```elixir
StarkInfra.PixReversal.Log.get!("5155165527080960") 
|> IO.inspect
```

### Get your PixBalance 

To see how much money you have in your account, run:

```elixir
StarkInfra.PixBalance.get!() 
|> IO.inspect
```

### Create a PixStatement

Statements are generated directly by the Central Bank and are only available for direct participants.
To create a statement of all the transactions that happened on your account during a specific day, run:

```elixir
statement = StarkInfra.PixStatement.create!(
  after: Date.utc_today |> Date.add(-1), # This is the date that you want to create a statement.
  before: Date.utc_today |> Date.add(-1), # After and before must be the same date.
  type: "transaction"  # Options are "interchange", "interchangeTotal", "transaction".
) |> IO.inspect
```

### Query PixStatements

You can query multiple Pix statements according to filters. 

```elixir
statements = StarkInfra.PixStatement.query!(
  limit: 50,
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixStatement

Statements are only available for direct participants. To get a Pix statement by its id:

```elixir
statement = StarkInfra.PixStatement.get!("5674087007387648") 
|> IO.inspect
```

### Get a PixStatement .csv file

To get the .csv file corresponding to a Pix statement using its id, run:

```elixir
statement_csv = StarkInfra.PixStatement.get_csv!("5674087007387648")
file = File.open!("statement.zip", [:write])
IO.binwrite(file, statement_csv)
File.close(file)
```

### Create a PixKey

You can create a Pix Key to link a bank account information to a key id:

```elixir
key = StarkInfra.PixKey.create!(
  %StarkInfra.PixKey{
    key_id: "+5511989898989",
    bank_code: "34052649",
    account_number: "052649",
    branch_code: "0001",
    account_type: "checking",
    name: "Tyrion Lannister",
    tax_id: "012.345.678-90",
  }
) |> IO.inspect
```

### Query PixKeys

You can query multiple Pix keys you own according to filters.

```elixir
keys = StarkInfra.PixKey.query!(
  limit: 1,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  status: ["registered"],
  tags: ["iron", "suit"],
  ids: ["+5511989898989"],
)
|> Enum.take(10) 
|> IO.inspect
```

### Get a PixKey

Information on a Pix key may be retrieved by its id and the tax ID of the consulting agent.
An endToEndId must be informed so you can link any resulting purchases to this query,
avoiding sweep blocks by the Central Bank.

```elixir
StarkInfra.PixKey.get!("+5511989898989", "012.345.678-90") 
|> IO.inspect
```

### Patch a PixKey

Update the account information linked to a Pix Key.

```elixir
StarkInfra.PixKey.update!(
  "+5511989898989", 
  "reconciliation",
  name: "Tyrion Lannister"
) |> IO.inspect
```

### Cencel a PixKey

Cancel a specific Pix Key using its id.

```elixir
StarkInfra.PixKey.cancel!("+5511989898989") 
|> IO.inspect
```

### Query PixKey logs

You can query Pix key logs to better understand a Pix key life cycle. 

```elixir
StarkInfra.PixKey.Log.query!(
  limit: 50,
  ids: ["5729405850615808"],
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  types: ["created"],
  key_ids: ["+5511989898989"]
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixKey log

You can also get a specific log by its id.

```elixir
StarkInfra.PixKey.Log.get!("5729405850615808") 
|> IO.inspect
```

### Create a PixClaim

You can create a Pix claim to request the transfer of a Pix key from another bank to one of your accounts:

```elixir
StarkInfra.PixClaim.create!(
  %StarkInfra.PixClaim{
    account_created: DateTime.utc_now(),
    account_number: "123456789",
    account_type: "checking",
    branch_code: "0001",
    name: "Jamie Lanister",
    tax_id: "012.345.678-90",
    key_id: "+5511933571793",
  }
) |> IO.inspect
```

### Query PixClaims

You can query multiple Pix claims according to filters.

```elixir
StarkInfra.PixClaim.query!(
  limit: 1,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  status: ["registered"],
  type: "ownership",
  agent: "claimed",
  key_type: "phone",
  key_id: "+5511989898989"
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixClaim

After its creation, information on a Pix claim may be retrieved by its id.

```elixir
StarkInfra.PixClaim.get!("5729405850615808") 
|> IO.inspect
```

### Patch a PixClaim

A Pix Claim can be confirmed or canceled by patching its status.
A received Pix Claim must be confirmed by the donor to be completed.
Ownership Pix Claims can only be canceled by the donor if the reason is "fraud".
A sent Pix Claim can also be canceled.

```elixir
StarkInfra.PixClaim.update!(
  "5729405850615808", 
  status: "confirmed"
) |> IO.inspect
```

### Query PixClaim logs

You can query Pix claim logs to better understand Pix claim life cycles.

```elixir
logs = StarkInfra.PixClaim.Log.query!(
  limit: 50,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  types: ["registered"],
  claim_ids: ["5719405850615809"]
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixClaim log

You can also get a specific log by its id.

```elixir
StarkInfra.PixClaim.Log.get!("5719405850615809") 
|> IO.inspect
```

### Create a PixDirector

To register the Pix director contact information at the Central Bank, run the following:

```elixir
StarkInfra.PixDirector.create!(
  %StarkInfra.PixDirector{
    name: "Tyrion Lannister",
    email: "tyrion@lannister.com",
    phone: "+5511989898989",
    tax_id: "012.345.678-90",
  }
) |> IO.inspect
```

### Create PixInfractions

Pix infractions are used to report transactions that raise fraud suspicion, to request a refund or to 
reverse a refund. Pix infractions can be created by either participant of a transaction.

```elixir
StarkInfra.PixInfraction.create!([
  %StarkInfra.PixInfraction{
    reference_id: "E20018183202201201450u34sDGd19lz",
    type: "fraud",
  }
]) |> IO.inspect
```

### Query PixInfractions

You can query multiple Pix infractions according to filters.

```elixir
StarkInfra.PixInfraction.query!(
  limit: 10,
  after: "2022-01-01",
  before: "2022-01-12",
  status: ["delivered"],
  ids: ["5729405850615808"],
)
|> Enum.take(10)
|> IO.inspect
```

### Get a PixInfraction

After its creation, information on a Pix Infraction may be retrieved by its id.

```elixir
StarkInfra.PixInfraction.get!("5155165527080960") |> IO.inspect
```

### Update a PixInfraction

A received Pix Infraction can be confirmed or declined by patching its status.
After a Pix Infraction is patched, its status changes to closed.

```elixir
StarkInfra.PixInfraction.update!(
  "5155165527080960", 
  "agreed"
) |> IO.inspect
```

### Cancel a PixInfraction

Cancel a specific Pix Infraction using its id.

```elixir
StarkInfra.PixInfraction.cancel!("5155165527080960") 
|> IO.inspect
```

### Query PixInfraction logs

You can query Pix infractions logs to better understand their life cycles. 

```elixir
StarkInfra.PixInfraction.Log.query!(
  limit: 50,
  ids: ["5729405850615808"],
  after: "2022-01-01",
  before: "2022-01-20",
  types: ["created"],
  infraction_ids: ["5155165527080960"]
)
|> Enum.take(50)
|> IO.inspect
```

### Get a PixInfraction log

You can also get a specific log by its id.

```elixir
StarkInfra.PixInfraction.Log.get!("5155165527080960") 
|> IO.inspect
```

### Create PixChargebacks

A Pix chargeback can be created when fraud is detected on a transaction or a system malfunction 
results in an erroneous transaction.

```elixir
StarkInfra.PixChargeback.create!(
  %StarkInfra.PixChargeback{
    amount: 100,
    reference_id: "E20018183202201201450u34sDGd19lz",
    reason: "fraud",
  }
)
|> Enum.take(100)
|> IO.inspect
```

### Query PixChargebacks

You can query multiple Pix chargebacks according to filters.

```elixir
chargebacks = StarkInfra.PixChargeback.query!(
  limit: 1,
  after: "2022-01-01",
  before: "2022-01-12",
  status: ["registered"],
  ids: ["5155165527080960"]
)
|> Enum.take(1)
|> IO.inspect
```

### Get a PixChargeback

After its creation, information on a Pix Chargeback may be retrieved by its.

```elixir
StarkInfra.PixChargeback.get!("5155165527080960") 
|> IO.inspect
```

### Update a PixChargeback

A received Pix Chargeback can be accepted or rejected by patching its status.
After a Pix Chargeback is patched, its status changes to closed.

```elixir
StarkInfra.PixChargeback.update!(
  "5155165527080960", 
  "accepted",
  reversal_reference_id: StarkInfra.Utils.ReturnId.create!("20018183")
) |> IO.inspect
```

### Cancel a PixChargeback

Cancel a specific Pix Chargeback using its id.

```elixir
StarkInfra.PixChargeback.cancel!("5155165527080960") 
|> IO.inspect
```

### Query PixChargeback logs

You can query Pix chargeback logs to better understand Pix chargeback life cycles. 

```elixir
StarkInfra.PixChargeback.Log.query!(
  limit: 50,
  ids: ["5729405850615808"],
  after: "2022-01-01",
  before: "2022-01-20",
  types: ["created"],
  chargeback_ids: ["5155165527080960"]
)
|> Enum.take(50)
|> IO.inspect
```
### Get a PixChargeback log

You can also get a specific log by its id.

```elixir
StarkInfra.PixChargeback.Log.get!("5155165527080960") 
|> IO.inspect
```

### Query PixDomains

You can query for domains of registered SPI participants able to issue dynamic QR Codes.

```elixir
StarkInfra.PixDomain.query!() 
|> IO.inspect
```

## Credit Note

### Create CreditNotes

You can create a Credit Note to generate a CCB contract:

```elixir
StarkInfra.CreditNote.create!([
  %StarkInfra.CreditNote{
    template_id: "5686220801703936",
    name: "Jamie Lannister",
    tax_id: "012.345.678-90",
    nominal_amount: 100000,
    scheduled: "2022-04-28",
    invoices: [
      %StarkInfra.CreditNote.Invoice{
        due: "2023-06-25",
        amount: 120000,
        fine: 10,
        interest: 2
      }
    ],
    tags: ["test", "testing"],
    payment: %StarkInfra.CreditNote.Transfer{
      due: "2023-06-25",
      amount: 120000,
      fine: 10,
      interest: 2
    }
    signers: [
      %StarkInfra.CreditNote.Transfer{
        due: "2023-06-25",
        amount: 120000,
        fine: 10,
        interest: 2
      }
    ],
    external_id: "my_unique_123",
    street_line_1: "Av. Paulista, 200", 
    street_line_2: "10 andar", 
    district: "Bela Vista", 
    city: "Sao Paulo", 
    state_code: "SP", 
    zip_code: "01310-000", 
  }
]) |> IO.inspect
```

**Note**: Instead of using CreditNote structs, you can also pass each CreditNote element in map format

### Query CreditNotes

You can query multiple credit notes according to filters.

```elixir
StarkInfra.CreditNote.query!(
  limit: 10,
  after: Date.utc_today |> Date.add(-30),
  before: Date.utc_today |> Date.add(-1),
  status: ["success"],
  tags: ["iron", "suit"]
)
|> Enum.take(10)
|> IO.inspect
```

### Get a CreditNote

After its creation, information on a credit note may be retrieved by its id.

```elixir
StarkInfra.CreditNote.get!("5155165527080960") 
|> IO.inspect
```

## Cancel a CreditNote

You can cancel a credit note if it has not been signed yet.

```elixir
StarkInfra.CreditNote.cancel!("5155165527080960") 
|> IO.inspect
```
  
### Query CreditNote logs

You can query credit note logs to better understand credit note life cycles. 

```elixir
StarkInfra.CreditNote.Log.query!(
  limit: 10,
  after: "2020-11-01",
  before: "2020-11-02"
)
|> Enum.take(10)
|> IO.inspect
```

### Get a CreditNote log

You can also get a specific log by its id.

```elixir
StarkInfra.CreditNote.log.get!("5155165527080960") 
|> IO.inspect
```

## Webhook

### Create a Webhook subscription

To create a webhook subscription and be notified whenever an event occurs, run:

```elixir
StarkInfra.Webhook.create!(
  url: "https://webhook.site/dd784f26-1d6a-4ca6-81cb-fda0267761ec",
  subscriptions: ["contract", "credit-note", "signer", "issuing-card", "issuing-invoice", "issuing-purchase", "pix-request.in", "pix-request.out", "pix-reversal.in", "pix-reversal.out", "pix-claim", "pix-key", "pix-chargeback", "pix-infraction"]
) |> IO.inspect
```

### Query Webhooks

To search for registered webhooks, run:

```elixir
for webhook <- StarkInfra.Webhook.query!() do
  webhook |> IO.inspect
end
```

### Get a Webhook subscription

You can get a specific webhook by its id.

```elixir
StarkInfra.Webhook.get!("6178044066660352")
|> IO.inspect
```

### Delete a Webhook subscription

You can also delete a specific webhook by its id.

```elixir
StarkInfra.Webhook.delete!("6178044066660352")
|> IO.inspect
```

## Webhook events

### Process Webhook events

It's easy to process events delivered to your Webhook endpoint.
Remember to pass the signature header so the SDK can make sure it was StarkInfra that sent you the event.

```elixir
response = listen()  # this is the function you made to get the events posted to your webhook

{event, _cache_pid} = StarkInfra.Event.parse!(
  content: response.content,
  signature: response.headers["Digital-Signature"]
) |> IO.inspect
```

To avoid making unnecessary requests to the API (/GET public-key), you can pass the `cache_pid` (returned on all requests)
on your next parse. The process referred by the PID `cache_pid` will store the latest Stark Bank public key
and automatically refresh it if an inconsistency is found between the content, signature and current public key.

**Note**: If you don't send the cache_pid to the parser, a new cache process will be generated.

```elixir
{event, _cache_pid} = StarkInfra.Event.parse!(
  content: response.content,
  signature: response.headers["Digital-Signature"],
  cache_pid: cache_pid
) |> IO.inspect
```

If the data does not check out with the Stark Bank public-key, the function will automatically request the
key from the API and try to validate the signature once more. If it still does not check out, it will raise an error.

### Query Webhook events

To search for webhooks events, run:

```elixir
StarkInfra.Event.query!(
  after: "2020-03-20",
  is_delivered: false,
  limit: 10
) 
|> Enum.take(10)
|> IO.inspect
```

### Get a Webhook event

You can get a specific webhook event by its id.

```elixir
StarkInfra.Event.get!("4568139664719872")
|> IO.inspect
```

### Delete a Webhook event

You can also delete a specific webhook event by its id.

```elixir
StarkInfra.Event.delete!("4568139664719872")
|> IO.inspect
```

### Set Webhook events as delivered

This can be used in case you've lost events.
With this function, you can manually set events retrieved from the API as
"delivered" to help future event queries with `is_delivered: false`.

```elixir
StarkInfra.Event.update!("5764442407043072", is_delivered: true)
|> IO.inspect
```

### Query failed Webhook event delivery attempts information

You can also get information on failed webhook event delivery attempts.

```elixir
for attempt <- StarkInfra.Event.Attempt.query!(after: "2020-03-20") do
  attempt |> IO.inspect attempt
end
```

### Get a failed Webhook event delivery attempt information

To retrieve information on a single attempt, use the following function:

```elixir
StarkInfra.Event.Attempt.get("1616161616161616")
|> IO.inspect
```

# Handling errors

The SDK may raise or return errors as the StarkInfra.Error struct, which contains the "code" and "message" attributes.

If you use bang functions, the list of errors will be converted into a string and raised.
If you use normal functions, the list of error structs will be returned so you can better analyse them.

# Help and Feedback

If you have any questions about our SDK, just send us an email.
We will respond you quickly, pinky promise. We are here to help you integrate with us ASAP.
We also love feedback, so don't be shy about sharing your thoughts with us.

Email: help@starkinfra.com