Project Title Fix GoAffPro + PayPal Integration for Custom Independent Lesson Website (Non-Shopify, PHP Only) Project Overview We are Smart Speak English School, an independent online education platform offering live English lessons worldwide. Our website is custom-built in PHP and JavaScript (not Shopify, WooCommerce, or Wix) and uses PayPal for all payments. We already have a GoAffPro Pro account connected: www.smartspeakenglish.com Our affiliate tracking currently fails after PayPal checkout. We require a developer who has previously integrated GoAffPro Pro into a custom PHP website to complete and correct the integration. If you have never used GoAffPro Pro on a custom PHP website, do not apply. Shopify or WooCommerce GoAffPro experience alone does not qualify. Current Situation GoAffPro Pro account active Referral parameter (?ref=) already implemented PayPal Smart Buttons already working Tracking breaks after PayPal checkout GoAffPro conversions are not being recorded Trial lessons cost $3 and must not generate commission Commissions apply only after verified payment for full packages (1-, 3-, or 6-month plans) Required Work We need an experienced developer to: Audit and correct GoAffPro + PayPal REST integration Implement proper server-side PayPal capture and GoAffPro postback Ensure the following flow functions correctly: Affiliate link → referral stored → payment via PayPal → server verification → GoAffPro conversion recorded Exclude the $3 trial from triggering any affiliate commission Ensure referral cookie tracking for 60 days, so affiliates are credited even if the customer returns and buys later Provide clear documentation and code comments when completed This task requires prior experience. It is not suitable for developers who wish to learn GoAffPro on this project. Technical Environment Custom PHP + JavaScript platform PayPal REST API (Smart Buttons + server-side verification) GoAffPro Pro merchant API / postback configuration No CMS, plugin, or e-commerce framework involved Objective To have a reliable affiliate system that: Correctly tracks referrals Credits affiliates only after confirmed PayPal payment Never credits trial transactions Operates consistently without manual intervention Access Provided Temporary GoAffPro access PayPal sandbox credentials Product list (six paid packages and one trial product) Communication with our internal developer for testing support Application Requirements You must confirm all of the following to be considered: You have integrated GoAffPro Pro on a custom PHP website before. Shopify/WooCommerce experience alone does not count. You have implemented PayPal REST API server-side capture. Briefly explain how you will ensure: Affiliate click → cookie → PayPal verification → GoAffPro conversion Provide proof of GoAffPro PHP integration experience (code sample, screenshot, or link) If you cannot meet these requirements, do not apply. Timeline Immediate start. We will begin as soon as a qualified developer is verified. Screening Questions to Enable Describe your GoAffPro-PHP integration experience. Provide proof (code, screenshot, or link). Have you implemented PayPal REST server-side capture before? Yes/No Explain this flow in your own words: Affiliate visit → purchase → verified payment → GoAffPro credited