A PHP Error was encountered

Severity: Warning

Message: Missing argument 1 for Products::buy()

Filename: controllers/Products.php

Line Number: 17

Backtrace:

File: /home/instantfunnelmac/public_html/paypal-ci-master/application/controllers/Products.php
Line: 17
Function: _error_handler

File: /home/instantfunnelmac/public_html/paypal-ci-master/index.php
Line: 315
Function: require_once

Processing Payment...

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