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My site is custom developed using PHP and MySQL.
The old developer used some 3rd-party CMS.
It has a PayPal Payment Module (files attached).
Currently, it only supports 'one time payment' with the Invoice system.
I am looking for someone who can go through the code and modify it to support PayPal Recurring Payment (2 options: Half-yearly and Annually)
It MUST work properly with the Invoice System.
BUDGET:$10 to $30.