A payment integration connects the customer’s checkout to a provider’s payment service and your server-side order handling. The exact steps depend on your business country, currencies, checkout channel, accepted payment methods, and whether you authorize now and capture later or charge immediately. Here, “open platform” means a payment service with an API or SDK; PayPal Checkout and Stripe PaymentIntents are documented examples, not a recommendation or proof of which platform the title intended.
Decide what your payment flow needs to support
Before choosing a provider or writing code, define the transaction you need to process. These requirements determine which checkout and API flow is suitable.
- Merchant location and currencies: Check provider eligibility and supported currencies for the countries where your business operates and customers pay.
- Checkout channel: Decide whether customers pay on your website, in an app, or through a hosted checkout page.
- Payment methods: List the methods your customers need, then confirm they are available for your location and checkout channel.
- Payment timing: Decide whether to capture payment immediately or authorize it first and capture it later, if the chosen flow supports that.
- Business model: Establish whether you need one-time payments, recurring payments, or both.
Also consider how the provider handles customer authentication, refunds, settlement, reporting, and support for asynchronous payment outcomes. The available documentation does not establish a universally best provider, comparative pricing, or a cross-provider performance advantage.
Set up a developer account and protect credentials
Create the relevant merchant or developer account, register an application if required, and obtain sandbox credentials. Keep secret credentials on your server; do not embed them in browser code or a mobile app. PayPal’s Checkout quick-start documentation describes obtaining sandbox credentials and using its JavaScript SDK together with server-side API calls.
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Keep test credentials and production credentials separate. Use the provider’s documented production configuration when you are ready to accept live payments; the exact account setup and activation requirements depend on the provider and merchant region.
Connect the customer’s checkout to server-side payment actions
A typical integration has two parts: a customer-facing interface and server-side code that creates or updates the payment with the provider. The browser should not be trusted to decide that an order has been paid.
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- Collect the payment choice in the checkout. Render the provider’s approved SDK components, hosted checkout, or payment fields for the flow you selected.
- Create an internal order. Assign the order a stable identifier in your own system before initiating payment. Use that identifier to connect your order record to the provider’s reference.
- Ask your server to create the payment object. The browser calls your server endpoint; your server makes the authenticated request to the provider to create the order or payment object.
- Return only the data the browser needs. Pass back the appropriate client token or session data for the selected integration. Keep secret API credentials server-side.
- Confirm or capture through the required flow. Complete confirmation, authorization, or capture using the provider’s documented steps. In PayPal’s quick start, the JavaScript SDK supports the customer-facing buttons while server-side endpoints create and capture orders.
- Update your order from verified payment results. Record the provider reference and payment state, and let the server determine whether fulfillment is permitted.
Stripe describes a PaymentIntent as an object that guides the process of collecting a payment. Its documentation recommends one PaymentIntent per order or customer session. See Stripe’s Payment Intents API reference.
Track payment states and handle webhooks
Customer approval is not always the same as completed payment. A payment may be pending, later completed, reversed, or denied. Your order system should represent these states rather than treating a return to the success page as proof of payment.
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When the provider supports webhooks, configure an endpoint to receive payment updates and verify that incoming notifications are authentic using the provider’s documented method. Process events safely: duplicate notifications should not create duplicate orders, fulfillment, or refunds. Link each event to your stable internal order ID and provider reference.
PayPal’s webhook guidance distinguishes approval and pending capture from completed capture, reversal, and denial. PayPal advises waiting for successful capture before fulfillment when capture is pending. The precise event names and verification steps are provider-specific.
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Test the complete flow in a sandbox
Before launch, use sandbox accounts and test the outcomes that matter to your checkout and business rules. Do not limit testing to a single successful payment.
- Successful payment, including the expected transition from approval to completion.
- Customer cancellation, browser closure, and return to checkout after an interrupted attempt.
- Declines, authentication challenges, and server or provider API errors.
- Pending outcomes and later completion or denial where relevant to the methods you accept.
- Webhook delivery, verification, retries, and duplicate notifications.
- Recovery when the browser does not return to your site even though the provider later reports a payment result.
PayPal’s integration and webhook documentation covers sandbox testing, negative scenarios, and event handling. Build your tests around the methods and lifecycle states your chosen provider actually supports.
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Switch to production and operate the integration
When testing is complete, configure production credentials and provider settings for the merchant account and region you will use. Confirm that live checkout requests reach your server, payment results update the correct internal orders, and webhook events are being received and processed.
After launch, monitor payment states, API errors, webhook processing, refunds, and orders that remain pending longer than your business rules allow. Follow the provider’s documentation for operational details such as settlement and refund handling; the sources cited here do not establish region-specific compliance obligations, pricing, or settlement timing.
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