LiqPay Payments

Online payments for the Celena shop plugin through LiqPay (PrivatBank).

• LiqPay Checkout v3: the payment form is signed on the server, amount and currency come from the order, never from the browser.
• Callback POST /webhooks/liqpay with signature verification (hash_equals); a mismatch returns 400 and changes nothing.
• Idempotent by design: every callback event is stored with a unique key, repeated deliveries are answered without touching the order.
• Underpayment protection: a callback for less than the order total keeps the payment pending instead of closing the order.
• Status mapping into the shop: success/sandbox → paid, reversed → refunded, failure/error → failed, with order history written by the shop helper.
• Full and partial refunds from the payment log, plus a manual "check status" button for stuck transactions.
• Payment log with filters, search by order or transaction id, pay type, provider status and error text.
• Sandbox mode for testing, selectable pay types (card, Privat24, Apple Pay, Google Pay, instalments) and payment page language (uk/en).
• Private key stored in site options, shown only as a mask, never rendered back into the form or into logs.
• Currencies: UAH, USD, EUR. Interface in English, Russian and Ukrainian.