Paystack Standard

Single payment integration

Do a redirect to the authorization URL received from calling the transaction/initialize endpoint. This URL is valid for one time use, so ensure that you generate a new URL per transaction.

When the payment is successful, we will call your callback URL (as setup in your dashboard or while initializing the transaction) and return the reference sent in the first step as a query parameter.

If you use a test secret key, we will call your test callback url, otherwise, we'll call your live callback url.

0. Prerequisites

Confirm that your server can conclude a TLSv1.2 connection to Paystack's servers. Most up-to-date software have this capability. Contact your service provider for guidance if you have any SSL errors.

Don't disable SSL peer verification!

1. Prepare your parameters

email and amount are the most common compulsory parameters. Do send a unique email per customer. If your customers do not provide a unique email, please devise a strategy to set one for each of them. The amount we accept on all endpoint are in kobo and must be an integer value. For instance, to accept 456 naira, 78 kobo, please send 45678 as the amount.

2. Initialize a transaction

$curl = curl_init();

$email = "your@email.com";
$amount = 30000;  //the amount in kobo. This value is actually NGN 300

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://api.paystack.co/transaction/initialize",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'amount'=>$amount,
    'email'=>$email,
  ]),
  CURLOPT_HTTPHEADER => [
    "authorization: Bearer sk_test_36658e3260b1d1668b563e6d8268e46ad6da3273", //replace this with your own test key
    "content-type: application/json",
    "cache-control: no-cache"
  ],
));

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

if($err){
  // there was an error contacting the Paystack API
  die('Curl returned error: ' . $err);
}

$tranx = json_decode($response, true);

if(!$tranx->status){
  // there was an error from the API
  print_r('API returned error: ' . $tranx['message']);
}

// comment out this line if you want to redirect the user to the payment page
print_r($tranx);

// redirect to page so User can pay
// uncomment this line to allow the user redirect to the payment page
//header('Location: ' . $tranx['data']['authorization_url']);

$curl = curl_init();

$email = "your@email.com";
$amount = 30000;  //the amount in kobo. This value is actually NGN 300

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://api.paystack.co/transaction/initialize",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'amount'=>$amount,
    'email'=>$email,
  ]),
  CURLOPT_HTTPHEADER => [
    "authorization: Bearer sk_test_36658e3260b1d1668b563e6d8268e46ad6da3273", //replace this with your own test key
    "content-type: application/json",
    "cache-control: no-cache"
  ],
));

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

if($err){
  // there was an error contacting the Paystack API
  die('Curl returned error: ' . $err);
}

$tranx = json_decode($response, true);

if(!$tranx->status){
  // there was an error from the API
  print_r('API returned error: ' . $tranx['message']);
}

// comment out this line if you want to redirect the user to the payment page
print_r($tranx);


// redirect to page so User can pay
// uncomment this line to allow the user redirect to the payment page
//header('Location: ' . $tranx['data']['authorization_url']);

Initialize a transaction by calling our API.

When the user enters their card details, Paystack will validate and charge the card. When successful, Paystack will:

Redirect back to a callback_url set when initializing the transaction or on your dashboard at: https://dashboard.paystack.co/#/settings/developer . If neither is set, Customers see a "Transaction was successful" message.
Send a charge.success event to your Webhook URL set at: https://dashboard.paystack.co/#/settings/developer
If receipts are not turned off, an HTML receipt will be sent to the customer's email.

Before you give value to the customer, please make a server-side call to our verification endpoint to confirm the status and properties of the transaction.

3. Handle charge.success Event

We will post a charge.success event to the webhook URL set for your transaction's domain. If it was a live transaction, we will post to your live webhook url and vice-versa.

if using .htaccess, remember to add the trailing / to the url you set.
Do a test post to your URL and ensure the script gets the post body.
Only set a publicly available url (http://localhost cannot receive!)

handle-webhook.php

<?php

// Retrieve the request's body
$body = @file_get_contents("php://input");
$signature = (isset($_SERVER['HTTP_X_PAYSTACK_SIGNATURE']) ? $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] : '');

/* It is a good idea to log all events received. Add code *
 * here to log the signature and body to db or file       */

if (!$signature) {
    // only a post with paystack signature header gets our attention
    exit();
}

define('PAYSTACK_SECRET_KEY','sk_xxxx_xxxxxx');
// confirm the event's signature
if( $signature !== hash_hmac('sha512', $body, PAYSTACK_SECRET_KEY) ){
  // silently forget this ever happened
  exit();
}

http_response_code(200);
// parse event (which is json string) as object
// Give value to your customer but don't give any output
// Remember that this is a call from Paystack's servers and 
// Your customer is not seeing the response here at all
$event = json_decode($body);
switch($event->event){
    // charge.success
    case 'charge.success':
        // TIP: you may still verify the transaction
    		// before giving value.
        break;
}
exit();

<?php

// Retrieve the request's body
$body = @file_get_contents("php://input");
$signature = (isset($_SERVER['HTTP_X_PAYSTACK_SIGNATURE']) ? $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] : '');

/* It is a good idea to log all events received. Add code *
 * here to log the signature and body to db or file       */

if (!$signature) {
    // only a post with paystack signature header gets our attention
    exit();
}

define('PAYSTACK_SECRET_KEY','sk_xxxx_xxxxxx');
// confirm the event's signature
if( $signature !== hash_hmac('sha512', $body, PAYSTACK_SECRET_KEY) ){
  // silently forget this ever happened
  exit();
}

http_response_code(200);
// parse event (which is json string) as object
// Give value to your customer but don't give any output
// Remember that this is a call from Paystack's servers and 
// Your customer is not seeing the response here at all
$event = json_decode($body);
switch($event->event){
    // charge.success
    case 'charge.success':
        // TIP: you may still verify the transaction
    		// before giving value.
        break;
}
exit();

4. Verify Transaction

After we redirect to your callback url, please verify the transaction before giving value.

callback.php

<?php

$curl = curl_init();
$reference = isset($_GET['reference']) ? $_GET['reference'] : '';
if(!$reference){
  die('No reference supplied');
}

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://api.paystack.co/transaction/verify/" . rawurlencode($reference),
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => [
    "accept: application/json",
    "authorization: Bearer SECRET_KEY",
    "cache-control: no-cache"
  ],
));

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

if($err){
	// there was an error contacting the Paystack API
  die('Curl returned error: ' . $err);
}

$tranx = json_decode($response);

if(!$tranx->status){
  // there was an error from the API
  die('API returned error: ' . $tranx->message);
}

if('success' == $tranx->data->status){
  // transaction was successful...
  // please check other things like whether you already gave value for this ref
  // if the email matches the customer who owns the product etc
  // Give value
}

Read more about the transaction/initialize endpoint on our API reference: Initialize Transaction

Paystack

The Paystack Developer Documentation

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