01
Custom payment gateway plugin
Integrate documented providers using a maintainable WooCommerce gateway extension, configurable merchant settings, secure API authentication, and appropriate order handling.
Custom WooCommerce payment gateway development
Custom WooCommerce Payment Gateway Integration
Need a payment provider connected to WooCommerce, a reliable hosted checkout, or help with failing callbacks? I build and troubleshoot gateway plugins, Checkout Block support, payment confirmation, refunds, and order-status workflows, with testing built around your provider API.
Custom gateways · Checkout Block · Webhooks · Refunds · Sandbox testing
Provider API first
Built around available documentation, merchant capabilities, and payment methods.
Reliable order states
Verify confirmations, retries, callbacks, and duplicate events before changing order status.
Test before launch
Sandbox scenarios, Checkout Block checks, and a clear release and handover plan.
When checkout cannot be trusted
A payment integration must handle more than the happy path.
Successful checkout requires a dependable handoff between WooCommerce and the provider. Timeouts, delayed webhooks, duplicate notifications, mismatched amounts, and unavailable payment methods need explicit handling, not guesswork.
- 01The payment method is missing from Checkout Block or only works with classic checkout.
- 02Customers pay successfully, but WooCommerce leaves orders pending or on hold.
- 03Callbacks are missed, duplicated, or accepted without enough verification.
- 04Refunds, recurring payments, provider errors, and settlement states are not reconciled correctly.
Payment integration services
Gateway development and payment troubleshooting built for your WooCommerce setup.
02
Classic checkout and Checkout Block
Handle the gateway processing API and add the separate Checkout Block payment-method registration where required. Verify visibility and buyer experience in both checkout types.
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Webhooks and payment verification
Validate provider signatures or trusted authorization mechanisms, match the payment to the correct order, handle duplicate notifications, and reconcile delayed outcomes.
04
Refunds, recurring billing, and operations
Implement supported refund or tokenization capabilities when the provider offers them, inspect logs safely, and define how store teams resolve uncertain transactions.
Interactive workflow example
Try a simulated WooCommerce payment lifecycle
See how a gateway should respond to an approved payment, a provider decline, or delayed confirmation. This is an educational browser simulation, not a live checkout or proof of an installed gateway.
Example order · $49.00
Ready to simulate
Choose a payment outcome
Select a scenario to see the simulated provider response, callback check, and resulting WooCommerce order state.
Demo only: No card details are entered, no payment request is sent, no money is moved, and no order is created. The provider outcomes are predefined examples.
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Checkout submission
An example order is ready for payment.
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Provider response
The gateway requests an authorization or payment result.
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Callback verification
A secure callback is checked when available.
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WooCommerce order state
The order should follow the verified provider outcome.
Technical references: WooCommerce Payment Gateway API · Checkout Block payment integration
Practical development guidance
Troubleshooting and integration guides
A useful gateway project starts with a clear failure description and the order or payment state where it occurred.
Payment gateway failure checklist
Separate provider declines, checkout issues, and WooCommerce order-state problems before changing code.
Review payment troubleshootingWooCommerce webhooks not working
Understand delivery failures, retries, logs, signatures, and safe event processing.
Read the webhook guideDiagnose checkout problems
Investigate blocked submission, incompatible extensions, and checkout failures without guessing.
Read the checkout checklistVisual examples
The two sides of a dependable payment integration
These illustrative visuals explain integration concepts. They do not show a live merchant dashboard or a real payment.
Safe integration process
Define the payment lifecycle before writing the gateway.
The exact architecture depends on the provider API, supported checkout methods, and the current WooCommerce setup.
Check the provider and existing checkout
Review API documents, merchant capabilities, currencies, payment types, current checkout architecture, and the intended payment lifecycle.
Define states, signatures, and idempotency
Plan payment creation, redirects, timeouts, webhook verification, safe retries, order notes, and exception handling before development.
Integrate with supported WooCommerce APIs
Implement the provider adapter, merchant settings, Checkout Block support when necessary, and reliable order updates without storing raw card details.
Verify both successes and failures
Exercise sandbox approvals, declines, duplicate callbacks, delayed confirmations, refunds when supported, and go-live configuration.
What responsible integration looks like
Maintainable · Tested · Business-focusedA successful redirect is not proof of a settled payment.
The verified provider result must drive the correct order outcome. An uncertain response should be reconciled rather than blindly recharged, and payment confirmation should use WooCommerce order APIs after validating identity, amount, currency, and transaction state.
Who this service helps
Best for stores and agencies with a documented payment provider or a specific payment problem.
If you have provider documentation, merchant sandbox access, or a gateway that fails in a reproducible way, I can review the integration path and propose a focused scope. Support for subscriptions, refunds, saved methods, and multi-currency depends on the provider and the store stack.
Share the website URL, provider name, checkout type, expected behavior, and redacted error details. Do not send live API secrets, payment card numbers, or private customer data through the contact form.
Frequently asked
WooCommerce payment gateway integration FAQs
Can you integrate a local or less common payment gateway?
Often, yes, if the provider offers documented APIs and a usable merchant test environment. I check the available endpoints, authentication methods, callbacks, and capabilities before confirming scope.
Why does a gateway work in classic checkout but not Checkout Block?
Checkout Block uses a distinct payment-method registration and client interface in addition to gateway processing. A classic-only gateway may need a separate Blocks integration and testing.
What if the customer pays but the WooCommerce order stays pending?
First determine whether the provider settled, authorized, declined, or still has an uncertain result. Inspect authenticated callbacks, transaction references, amount matching, logs, and retries. Never mark an order paid solely because the browser returned to the success page.
Can the integration support refunds or subscriptions?
Potentially. This depends on the provider refund API, saved payment token or recurring-billing support, authorization model, and your WooCommerce extensions. These features are not implied by a one-time payment API.
Do you handle payment security and compliance?
I can implement secure API requests, secret handling, request verification, and error logging. Provider onboarding, PCI scope, chargeback policy, merchant compliance, and formal security audits require the appropriate provider or specialist review.
Is the payment demo a real checkout?
No. It is a browser-only illustration of approval, rejection, and delayed callback outcomes. No money moves, no customer data is collected, and no WooCommerce order is created.
What information do you need to estimate the project?
The current site URL, provider documentation, payment methods and currencies, whether Checkout Block is used, a reproducible issue or required flow, and sandbox access shared through a secure channel.
Primary next step
Need a reliable custom payment gateway or checkout fix?
Send the provider, store URL, checkout setup, and a brief description of the desired payment flow. I will review the technical prerequisites and suggest the safest next step.