curl --request POST \
  --url https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "CUSTOMER_CANCELLATION",
  "description": "Customer requested cancellation",
  "idempotencyKey": "1b4e28ba-2fa1-11d2-883f-0016d3cca427"
}
'

import requests

url = "https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal"

payload = {
    "reason": "CUSTOMER_CANCELLATION",
    "description": "Customer requested cancellation",
    "idempotencyKey": "1b4e28ba-2fa1-11d2-883f-0016d3cca427"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    reason: 'CUSTOMER_CANCELLATION',
    description: 'Customer requested cancellation',
    idempotencyKey: '1b4e28ba-2fa1-11d2-883f-0016d3cca427'
  })
};

fetch('https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'reason' => 'CUSTOMER_CANCELLATION',
    'description' => 'Customer requested cancellation',
    'idempotencyKey' => '1b4e28ba-2fa1-11d2-883f-0016d3cca427'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal"

	payload := strings.NewReader("{\n  \"reason\": \"CUSTOMER_CANCELLATION\",\n  \"description\": \"Customer requested cancellation\",\n  \"idempotencyKey\": \"1b4e28ba-2fa1-11d2-883f-0016d3cca427\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"reason\": \"CUSTOMER_CANCELLATION\",\n  \"description\": \"Customer requested cancellation\",\n  \"idempotencyKey\": \"1b4e28ba-2fa1-11d2-883f-0016d3cca427\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"reason\": \"CUSTOMER_CANCELLATION\",\n  \"description\": \"Customer requested cancellation\",\n  \"idempotencyKey\": \"1b4e28ba-2fa1-11d2-883f-0016d3cca427\"\n}"

response = http.request(request)
puts response.read_body

{
  "success": true,
  "result": {
    "id": "d4e5f6a7-b8c9-4012-8345-6789abcdef01",
    "accountId": "b2a1f0e9-8c7d-4e3a-9f21-0a1b2c3d4e5f",
    "amount": {
      "fiat": 25,
      "crypto": "25.000000"
    },
    "currency": "USD",
    "status": "REVERSING",
    "reversalReason": "CUSTOMER_CANCELLATION",
    "reversalDescription": "Customer requested cancellation",
    "executions": [
      {
        "id": "b8c9d0e1-f2a3-4456-c789-abcdef012345",
        "walletPairId": "f6a7b8c9-d0e1-4234-a567-89abcdef0123",
        "type": "REVERSAL",
        "chain": "BASE",
        "asset": "USDC",
        "amount": 25,
        "exchangeRate": 1,
        "status": "PENDING",
        "createdAt": "2026-01-15T10:05:00Z",
        "updatedAt": "2026-01-15T10:05:00Z"
      }
    ],
    "createdAt": "2026-01-15T09:30:00Z",
    "updatedAt": "2026-01-15T10:05:00Z"
  }
}

{
  "success": false,
  "errors": [
    {
      "code": "invalid-request",
      "message": "The request contains invalid parameters."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "unauthenticated",
      "message": "Please authenticate to perform this action."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "forbidden",
      "message": "You do not have permission to access this resource."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "account-not-found",
      "message": "The requested resource was not found."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "concurrent-modification",
      "message": "This request has been modified by another user. Please refresh and try again."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "idempotency-conflict",
      "message": "This idempotency key was already used with a different request."
    }
  ]
}

{
  "success": false,
  "errors": [
    {
      "code": "internal-error",
      "message": "An unexpected error occurred. Please try again later."
    }
  ]
}