# Quick Start

<BraEng />

This guide shows the process of cancelling a payment, using Carat Portal's REST web service interface.

## What you'll need

- `esitef_usn` of a payment confirmed on Carat Portal. [Learn more.](pagamento-rest-quickstart.md)
- A tool capable of performing HTTP calls, such as Postman, REST Client or cURL
- An application capable of receiving POST HTTPS calls

## Creating a cancel transaction

**HTTP method**: POST

**URL**: https\://<URLPOSTMAN/>/e-sitef/api/v1/cancellations

**Headers**:

- **Content-Type**: application/json
- **merchant_id**: {your merchant id}
- **merchant_key**: {your merchant key}

**Request**:  
Fill the **\<payment_usn\>** field in the request below with the `esitef_usn` obtained in the payment response.

<!--DOCUSAURUS_CODE_TABSS-->

<!--JSONN-->

To use this example, don't forget to define the variable `{{url}}` to the value<br/> **<URLPOSTMAN/>**

```json
{
  "esitef_usn": "<payment_usn>"
}
```

<!--cURLL-->

```curl
curl
--request POST "https://{{url}}/e-sitef/api/v1/cancellations"
--header "Content-Type: application/json"
--header "merchant_id: xxxxxxxxxxx"
--header "merchant_key: xxxxxxxxxxx"
--data-binary
{
   "esitef_usn":"<payment_usn>"
}
--verbose
```

<!--END_DOCUSAURUS_CODE_TABSS-->

**Receiving the authenticity POST:**

<!--DOCUSAURUS_CODE_TABSS-->

<!--Java + Spring Frameworkk-->

```java
@RestController
public class MyAuthenticityController {

    @PostMapping(value = "/myauthenticity",
        consumes = "application/x-www-form-urlencoded; charset=utf-8")
    public ResponseEntity<String> myAuthenticity(@RequestParam Map<String, String> request) {
        Log.info("nit = " + request.get("nit"));
        // ...
        // stores the cancel NIT
        // ...
        return new ResponseEntity<>("OK", HttpStatus.OK);
    }

}
```

<!--END_DOCUSAURUS_CODE_TABSS-->

**Response**:

```json
{
  "code": "0",
  "message": "OK. Transaction successful."
}
```

[Learn more about this service.](cancelamento-rest-begin.md)

## Cancelling the payment

**HTTP method**: PUT

**URL**: https\://<URLPOSTMAN/>/e-sitef/api/v1/cancellations/**\<nit\>**

Replace the **\<nit\>** field in the URL above with the NIT obtained on the authenticity POST.

**Headers**:

- **Content-Type**: application/json
- **merchant_id**: {your merchant id}
- **merchant_key**: {your merchant key}

**Request**:

<!--DOCUSAURUS_CODE_TABSS-->

<!--JSONN-->

To use this example, don't forget to define the variable `{{url}}` to the value<br/> **<URLPOSTMAN/>**

```json
{
  "card": {
    "number": "5555555555555555",
    "expiry_date": "1222",
    "security_code": "601"
  },
  "amount": "1"
}
```

<!--cURLL-->

```curl
curl
--request PUT "https:{{url}}/e-sitef/api/v1/cancellations/<nit>"
--header "Content-Type: application/json"
--header "merchant_id: xxxxxxxxxxx"
--header "merchant_key: xxxxxxxxxxx"
--data-binary
{
   "card":{
      "number":"5555555555555555",
      "expiry_date":"1222",
      "security_code":"601"
   },
   "amount":"1"
}
--verbose
```

<!--END_DOCUSAURUS_CODE_TABSS-->

**Response**:

```json
{
  "code": "0",
  "message": "OK. Transaction successful.",
  "cancellation": {
    "authorizer_code": "000",
    "authorizer_message": "Transacao OK",
    "status": "CON",
    "nit": " <nit>",
    "order_id": "09062259711",
    "customer_receipt": "=== COMPROVANTE ===",
    "merchant_receipt": "=== COMPROVANTE ===",
    "authorizer_id": "2",
    "acquirer_id": "229",
    "acquirer_name": "Bin",
    "authorizer_date": "09/11/2017T18:23",
    "authorization_number": "092423",
    "merchant_usn": "9062259711",
    "esitef_usn": "171109108051261",
    "sitef_usn": "092424",
    "host_usn": "999092424   ",
    "amount": "1",
    "payment_type": "C",
    "issuer": "2",
    "authorizer_merchant_id": "000000000000005",
    "esitef_date": "09/11/2017T18:23",
    "is_host_cancel": "false"
  }
}
```

[Learn more about this service.](cancelamento-rest-docancel.md)

## Checking the cancel status

**HTTP method**: GET

**URL**: https\://<URLPOSTMAN/>/e-sitef/api/v1/transactions/**\<nit\>**

Replace the **\<nit\>** field in the URL above with the NIT obtained on the authenticity POST.

**Headers**:

- **Content-Type**: application/json
- **merchant_id**: {your merchant id}
- **merchant_key**: {your merchant key}

**Request**:

<!--DOCUSAURUS_CODE_TABSS-->

<!--cURLL-->

To use this example, don't forget to define the variable `{{url}}` to the value<br/> **<URLPOSTMAN/>**

```curl
curl
--request GET "https://{{url}}/e-sitef/api/v1/transactions/<nit>"
--header "merchant_id: xxxxxxxxxxxxxxx"
--header "merchant_key: xxxxxxxxxxx"
--verbose
```

<!--END_DOCUSAURUS_CODE_TABSS-->

**Response**:

```json
{
  "code": "0",
  "message": "OK. Transaction successful.",
  "cancellation": {
    "authorizer_code": "000",
    "authorizer_message": "Transacao OK",
    "status": "CON",
    "nit": " <nit>",
    "order_id": "09062259711",
    "customer_receipt": "=== COMPROVANTE ===",
    "merchant_receipt": "=== COMPROVANTE ===",
    "authorizer_id": "2",
    "acquirer_id": "229",
    "acquirer_name": "Bin",
    "authorizer_date": "09/11/2017T18:23",
    "authorization_number": "092423",
    "merchant_usn": "9062259711",
    "esitef_usn": "171109108051261",
    "sitef_usn": "092424",
    "host_usn": "999092424   ",
    "amount": "1",
    "payment_type": "C",
    "issuer": "2",
    "authorizer_merchant_id": "000000000000005",
    "esitef_date": "09/11/2017T18:23",
    "is_host_cancel": "false"
  }
}
```

[Learn more about this service.](pagamento-rest-getstatus.md)