Signed API, callback verify, ledger audit, server-side secrets.
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Per-request MD5-uppercase signatures, bcrypt password hashing, server-side-only upstream credentials, per-mutation ledger audit, and blocking payment simulation in live mode. Delete install.php after installation.
Learn Secure Integration →Merchant → payin_create (signed) → LottoPay → StarPago → QRIS/VA/E-Wallet → callback → verify → credit 1x → forward → HTTP 200 + SUCCESS
Use payin_query for reconciliation. Never trust browser status — trust verified callbacks + server queries.