curl --request POST \
  --url https://api.tandapay.io/api/b2b/fiat/payment-sdk \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 1500,
  "chargeCurrency": "KES",
  "walletCurrency": "KES",
  "externalReference": "order_10045",
  "customerId": "customer_123",
  "prefillData": {
    "firstName": "Brian",
    "lastName": "Otieno",
    "email": "brian@example.com",
    "phoneNumber": "+254712345678"
  },
  "successRedirectUrl": "https://merchant.co.ke/checkout/success",
  "failureRedirectUrl": "https://merchant.co.ke/checkout/failed",
  "cancelRedirectUrl": "https://merchant.co.ke/checkout/cancelled"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    amount: 1500,
    chargeCurrency: 'KES',
    walletCurrency: 'KES',
    externalReference: 'order_10045',
    customerId: 'customer_123',
    prefillData: {
      firstName: 'Brian',
      lastName: 'Otieno',
      email: 'brian@example.com',
      phoneNumber: '+254712345678'
    },
    successRedirectUrl: 'https://merchant.co.ke/checkout/success',
    failureRedirectUrl: 'https://merchant.co.ke/checkout/failed',
    cancelRedirectUrl: 'https://merchant.co.ke/checkout/cancelled'
  })
};

fetch('https://api.tandapay.io/api/b2b/fiat/payment-sdk', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.tandapay.io/api/b2b/fiat/payment-sdk"

payload = {
    "amount": 1500,
    "chargeCurrency": "KES",
    "walletCurrency": "KES",
    "externalReference": "order_10045",
    "customerId": "customer_123",
    "prefillData": {
        "firstName": "Brian",
        "lastName": "Otieno",
        "email": "brian@example.com",
        "phoneNumber": "+254712345678"
    },
    "successRedirectUrl": "https://merchant.co.ke/checkout/success",
    "failureRedirectUrl": "https://merchant.co.ke/checkout/failed",
    "cancelRedirectUrl": "https://merchant.co.ke/checkout/cancelled"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.tandapay.io/api/b2b/fiat/payment-sdk",
  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([
    'amount' => 1500,
    'chargeCurrency' => 'KES',
    'walletCurrency' => 'KES',
    'externalReference' => 'order_10045',
    'customerId' => 'customer_123',
    'prefillData' => [
        'firstName' => 'Brian',
        'lastName' => 'Otieno',
        'email' => 'brian@example.com',
        'phoneNumber' => '+254712345678'
    ],
    'successRedirectUrl' => 'https://merchant.co.ke/checkout/success',
    'failureRedirectUrl' => 'https://merchant.co.ke/checkout/failed',
    'cancelRedirectUrl' => 'https://merchant.co.ke/checkout/cancelled'
  ]),
  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;
}

{
  "success": true,
  "message": "Transaction created successfully",
  "data": {
    "transactionId": "aB3dE5fG7hJ9kL1mN2pQ",
    "paymentSdkLink": "https://gateway.tandapay.io/sdk/transaction/aB3dE5fG7hJ9kL1mN2pQ"
  }
}

{
  "success": false,
  "message": "Unauthorized"
}

{
  "success": false,
  "message": "Duplicate external reference",
  "errorCode": "DUPLICATE_EXTERNAL_REFERENCE"
}