Set up, build, debug, review, and explain HitPay payment integrations using official HitPay docs, Payment Request API, hosted checkout, Drop-In UI, webhooks, HMAC-SHA256 signatures, sandbox/live setup, API keys, webhook salt, payment methods, plugins, refunds, recurring billing, payouts, platform AP
Set up, build, debug, review, and explain HitPay payment integrations using official HitPay docs, Payment Request API, hosted checkout, Drop-In UI, webhooks, HMAC-SHA256 signatures, sandbox/live setup, API keys, webhook salt, payment methods, plugins, refunds, recurring billing, payouts, platform APIs, and status page checks. Use when working with HitPay Malaysia, FPX, DuitNow, Touch 'n Go, cards,