PayPal PayFlow API Error - paypal

Question

We are using PayFlow PayPal API for recurring payments, it gives us an issue.
We are sending amount $29 to the API but on PayPal log it is showing $1 only. When we asked PayPal support for this they said you are sending $1.
Please help us. Below is the code we have setup:
<?php
$payflow_partner = 'PayPal';
$payflow_vender = 'xxxxxxxxxxxxx';
$payflow_user = 'xxxxxxxxxxxx';
$payflow_pwd = 'XXXXXXXXX';
$payflow_url = 'https://pilot-payflowpro.paypal.com';
$first_name = 'First Name';
$last_name = 'Last Name';
$profile_name = $first_name.$last_name;
$plan_amount = 29.00;
$card_number = '4111111111111111';
$expiry_month = '05';
$expiry_year = '21';
$expiry = $expiry_month.$expiry_year;
$user_email = 'test#example.com';
$start_date = '01202017';
$post_list = 'TRXTYPE=R&TENDER=C&PARTNER='.$payflow_partner.'&VENDOR='.$payflow_vender.'&USER='.$payflow_user.'&PWD='.$payflow_pwd.'&ACTION=A&PROFILENAME='.$profile_name.'&AMT='.$plan_amount.'&CURRENCY=USD&ACCT='.$card_number.'&EXPDATE='.$expiry.'&START='.$start_date.'&PAYPERIOD=MONT&TERM=0&EMAIL='.$user_email.'&OPTIONALTRX=A&OPTIONALTRXAMT='.$plan_amount.'&COMMENT1=First-time-customer&STREET=sector-7-malviya-nagar&ZIP=302017&CITY=jaipur&STATE=rajasthan&COUNTRY=india&FIRSTNAME='.$first_name.'&MIDDLENAME='.$last_name.'&LASTNAME='.$last_name;
$headers = array();
$headers[] = "Content-Type: text/namevalue"; //or maybe text/xml
$headers[] = "X-VPS-Timeout: 3000";
$headers[] = "X-VPS-VIT-OS-Name: Linux"; // Name of your OS
$headers[] = "X-VPS-VIT-OS-Version: RHEL 4"; // OS Version
$headers[] = "X-VPS-VIT-Client-Type: PHP/cURL"; // What you are using
$headers[] = "X-VPS-VIT-Client-Version: 0.01"; // For your info
$headers[] = "X-VPS-VIT-Client-Architecture: x86"; // For your info
$headers[] = "X-VPS-VIT-Client-Certification-Id:13fda2433fc2123d8b191d2d011b7fdc";
$headers[] = "X-VPS-VIT-Integration-Product: MyApplication"; // For your info, would populate with application name
$headers[] = "X-VPS-VIT-Integration-Version: 0.01"; // Application version
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $payflow_url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_HEADER, 1); // tells curl to include headers in response
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return into a variable
curl_setopt($ch, CURLOPT_TIMEOUT, 45); // times out after 45 secs
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); // this line makes it work under https
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_list); //adding POST data
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); //verifies ssl certificate
curl_setopt($ch, CURLOPT_FORBID_REUSE, TRUE); //forces closure of connection when done
curl_setopt($ch, CURLOPT_POST, 1); //data sent as POST
$result = curl_exec($ch);
$headers = curl_getinfo($ch);
curl_close($ch);
echo $result;

Answer 1

In your post data you are sending these two values:
AMT='.$plan_amount
OPTIONALTRXAMT='.$plan_amount
PayPal's documentation states that OPTIONALTRXAMT should only be used when OPTIONALTRX=S, which it is not in your case.
The documentation also states that Amount is ignored when OPTIONALTRX=A, which is what you are doing.
Note: Do not specify an amount when OPTIONALTRX=A. The amount is ignored.
So, remove the Optional parameters.