Amount: amount must be a valid payment amount

Question

0.00/5 (No votes)

See more:

Has anyone worked with payment integration using payfast to process cartData?
I am trying to process cartData to payfast payment integration gateway using pay using payfast not custom or onsite. Now I am getting this error when processing:

amount: Amount must be a valid payment amount.

How do I resolve this to allow an amount for payment?

What I have tried:

PHP

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

// Your cart data obtained from previous steps
$cartData = json_decode($_GET['cartData'], true); // Replace with the method you use to retrieve cart data

// Calculate cart total
$cartTotal = 0;
foreach ($cartData['cartItems'] as $item) {
    $cartTotal += $item['price'] * $item['quantity'];
}

$formattedAmount = number_format($cartTotal * 100, 2, '.', ''); // Use $cartTotal here

$data = array(
    // Merchant details
    'merchant_id' => '***067', // Replace with your merchant ID
    'merchant_key' => ' ****irme', // Replace with your merchant key
    'return_url' => 'https://www.splashonline.co.za/return.php', // Replace with your return URL
    'cancel_url' => 'https://www.splashonline.co.za/cancel.php', // Replace with your cancel URL
    'notify_url' => 'https://www.splashonline.co.za/notify.php', // Replace with your notify URL
    // Buyer details
    'name_first' => 'First Name',
    'name_last'  => 'Last Name',
    'email_address'=> 'gcira2023@outlook.com',
    // Transaction details
    'm_payment_id' => '1234', // Unique payment ID to pass through to notify_url
    'amount' => $formattedAmount,
    'item_name' => 'Order#123'
);

// If in testing mode make use of either sandbox.payfast.co.za or www.payfast.co.za
$testingMode = true;
$pfHost =  'www.payfast.co.za';
$htmlForm = '<form action="https://' . $pfHost . '/eng/process" method="post">';
foreach ($data as $name => $value) {
    $htmlForm .= '<input name="' . $name . '" type="hidden" value=\'' . $value . '\' />';
}
$htmlForm .= '<input type="submit" value="Pay Now" /></form>';
echo $htmlForm;
?>

Posted 25-Aug-23 3:18am

Gcobani Mkontwana

Updated 28-Aug-23 9:40am

Deeksha Shenoy

v2

Add a Solution

Comments

[no name] 25-Aug-23 9:56am

Did you try displaying the "amount", that is not "valid", to see what it is?

Gcobani Mkontwana 25-Aug-23 10:00am

@Gerry i did try to use 100.00 then it automatical redirected straight, but i want it to be dynamic it must capture data from cartData including the total dont want user to enter the total manual

BillWoodruff 26-Aug-23 8:29am

you need to add run-time validation when the current value is visible: how you can do that in PHP i don't have a clue.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Andre Oosthuizen · Accepted Answer · 2023-08-28T03:35:00

The 'number_format()' function you are using is incorrect - number_format() function [^]

I am not sure why you multiply the returned amount '$cartTotal' by 100.
First, test this value to see if it returns anything and that it is a number (check if you have added 'R' or '$' before the number, it will fail), if not catch the zero return and let the user know.
If it has a value, format the number properly -

PHP

$formattedAmount = number_format($cartTotal,2,".",",");

'$cartTotal' is the returned number
2 is the decimal counter, in this case '2/00'
The dot '.' is the cents/placemark seperator to show cents following the dot
The comma ',' is the thousand seperator

If I run the following, it returns '1,010.39' -

PHP

<?php
   $cartTotal = 110.3856;
?>

<span>
    <?php echo $formattedAmount;  ?>

Output is 1,010.39
</span>

You also need to check what is the requirements for PayFast as they might require a different format as accepted amount, yours need to be in the exact same format.