curl --request POST \
  --url https://sandbox.api.fin.com/v2/transactions/pay-ins \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Idempotency-Key: <x-idempotency-key>' \
  --data '
{
  "customer_id": "34c62166-3e7a-436b-a2e3-338c4148a859",
  "amount": 100101,
  "currency": "MXN",
  "destination": {
    "address": "0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E",
    "rail": "POLYGON",
    "currency": "USDC"
  },
  "developer_fee": {
    "fixed": 0,
    "percentage": 0
  }
}
'

const url = 'https://sandbox.api.fin.com/v2/transactions/pay-ins';
const options = {
  method: 'POST',
  headers: {
    'X-Idempotency-Key': '<x-idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    customer_id: '34c62166-3e7a-436b-a2e3-338c4148a859',
    amount: 100101,
    currency: 'MXN',
    destination: {
      address: '0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E',
      rail: 'POLYGON',
      currency: 'USDC'
    },
    developer_fee: {fixed: 0, percentage: 0}
  })
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

HttpResponse<String> response = Unirest.post("https://sandbox.api.fin.com/v2/transactions/pay-ins")
  .header("X-Idempotency-Key", "<x-idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customer_id\": \"34c62166-3e7a-436b-a2e3-338c4148a859\",\n  \"amount\": 100101,\n  \"currency\": \"MXN\",\n  \"destination\": {\n    \"address\": \"0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E\",\n    \"rail\": \"POLYGON\",\n    \"currency\": \"USDC\"\n  },\n  \"developer_fee\": {\n    \"fixed\": 0,\n    \"percentage\": 0\n  }\n}")
  .asString();

import requests

url = "https://sandbox.api.fin.com/v2/transactions/pay-ins"

payload = {
    "customer_id": "34c62166-3e7a-436b-a2e3-338c4148a859",
    "amount": 100101,
    "currency": "MXN",
    "destination": {
        "address": "0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E",
        "rail": "POLYGON",
        "currency": "USDC"
    },
    "developer_fee": {
        "fixed": 0,
        "percentage": 0
    }
}
headers = {
    "X-Idempotency-Key": "<x-idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

package main

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

func main() {

	url := "https://sandbox.api.fin.com/v2/transactions/pay-ins"

	payload := strings.NewReader("{\n  \"customer_id\": \"34c62166-3e7a-436b-a2e3-338c4148a859\",\n  \"amount\": 100101,\n  \"currency\": \"MXN\",\n  \"destination\": {\n    \"address\": \"0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E\",\n    \"rail\": \"POLYGON\",\n    \"currency\": \"USDC\"\n  },\n  \"developer_fee\": {\n    \"fixed\": 0,\n    \"percentage\": 0\n  }\n}")

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

	req.Header.Add("X-Idempotency-Key", "<x-idempotency-key>")
	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))

}

{
  "data": {
    "id": "728c95d3-8b1e-4497-b3da-f36bcc066d7d",
    "customer_id": "34c62166-3e7a-436b-a2e3-338c4148a859",
    "status": "PENDING",
    "transaction_id": null,
    "created_at": "2026-06-09T18:27:35.468309Z",
    "expire_at": "2026-06-10T18:27:35.437874Z",
    "source_amount": 100101,
    "source_amount_in_major": 1001.01,
    "currency": "MXN",
    "destination": {
      "address": "0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E",
      "rail": "POLYGON",
      "currency": "USDC"
    },
    "fees": {
      "developer_fee": {
        "fixed": 0,
        "percentage": 0
      },
      "total_developer_fee": 0,
      "network_fee": 0,
      "conversion_fee": 0,
      "total_fee": 0
    },
    "destination_amount_in_major": 57.324182,
    "exchange_rate": 17.462264,
    "deposit_instruction": {
      "type": "BANK_DEPOSIT",
      "bank_details": {
        "bank_name": "FINCO PAY",
        "bank_address": null,
        "bank_address_details": null,
        "bank_routing_number": null,
        "bank_account_number": "734180000129991804",
        "payment_rails": [
          "SPEI"
        ],
        "bank_country": "MEX",
        "account_type": "centralizing",
        "bank_code": {
          "code": "734180000129991804",
          "type": "CLABE"
        },
        "reference": "88ff4abb99e39499db661e1c97f0770fb1fb05c3",
        "account_holder_name": "FIN BU1"
      },
      "checkout_details": null
    }
  }
}

{
  "message": "Authentication failed"
}

{
  "message": "<string>",
  "errors": [
    {}
  ]
}