Online payment gateway integration for seamless payments

Purpose

1.1. Enable customers to make secure payments online directly from digital invoices for faster, seamless, and trackable transactions.
1.2. Reduce manual follow-up for payment collection and automate payment confirmation notifications.
1.3. Ensure compliance with PCI DSS standards for card data security and streamline bookkeeping through automated transaction recording.
1.4. Support multiple payment methods (credit/debit cards, ACH, e-wallets) to increase customer convenience and reduce barriers to payment.
1.5. Generate automated receipts and reports for accounting and auditing.

Trigger Conditions

2.1. Invoice generated or marked as “Ready for Payment”.
2.2. Customer clicks “Pay Now” button in email or client portal.
2.3. Payment completed via gateway, status update received via webhook.
2.4. Failed payment or payment reversal notification.
2.5. Scheduled installment becomes due (for split payments/subscriptions).

Platform Variants

3.1. Stripe
• API: `PaymentIntents` — Configure endpoint to create and confirm payments for each invoice.
• Webhook: `invoice.paid`, `invoice.payment_failed` configured to update invoice status.

3.2. PayPal
• REST API: `/v2/checkout/orders` — Create order for invoice, capture payment; IPN/Webhook to update records.

3.3. Square
• API: `CreatePayment` — Generate payment link; listen to `payment.created` webhook event.

3.4. Authorize.Net
• API: `createTransactionRequest` — Set up for invoicing module; use `Silent Post URL` for payment status.

3.5. Braintree (a PayPal Service)
• API: `Transaction.sale` and `WebhookNotification` for invoice fulfillment updates.

3.6. Razorpay
• API: `Orders` endpoint to generate payment link; `order.paid` webhook for payment confirmation.

3.7. Adyen
• API: `/payments` — Submit payment; configure webhook for `AUTHORISATION` event.

3.8. Mollie
• API: `/v2/payments` — Initiate payment with invoice metadata; use `payments webhook` for state changes.

3.9. Worldpay
• API: `Payments API` — Process payment, use `Webhook notifications` for update.

3.10. Klarna
• API: `Orders` — Initiate financing/payment, use `push notification` for status.

3.11. WePay
• API: `/checkout/create` — Generate invoice payment page, notify via webhooks for payment status.

3.12. GoCardless
• API: `Create Payment` — For direct debits, webhook for payment confirmations/failures.

3.13. Venmo (B2B via PayPal)
• Use PayPal API for Venmo processing, webhook for approval.

3.14. Wise
• API: `Create Transfer` — Used for international airbrush projects; webhook for delivery confirmation.

3.15. QuickBooks Payments
• API: `Create a Payment` for invoices generated in QuickBooks; webhook on payment.

3.16. Xero
• API: `Create Payment` against invoices; push updates when payment received.

3.17. Zoho Books
• API: `Invoices/Payments` – Link invoice to payment initiation, receive callback on payment.

3.18. Sage Pay (Opayo)
• API: `CreatePayment` — Confirm payment for invoice, process status webhooks.

3.19. Alibaba Alipay
• API: `Payment initiation` for cross-border clients, configure notification endpoint.

3.20. Apple Pay
• Via payment processor (e.g., Stripe), configure domain and endpoint for client-side payment collection.

3.21. Google Pay
• Integrate through supported gateways; enable tokenized payment and confirm via webhook.

Benefits

4.1. Accelerated payment processing, reducing average time to receive funds.
4.2. Minimized manual reconciliation with automatic updating of invoice status.
4.3. Enhanced security via PCI-compliant gateway handling.
4.4. Better customer experience with multiple options and automated confirmations.
4.5. Scalable and consistent financial workflow for growing airbrushing businesses.