Stripe Integration

Stripe has become the default payment platform for modern internet businesses — and for good reason. Its developer-first APIs, comprehensive documentation, and rich ecosystem of extensions make it possible to build sophisticated payment flows that would take months on other platforms. From SaaS subscriptions and marketplace payouts to one-time purchases and invoice billing, Stripe handles the complexities of payment processing, compliance, and global money movement. At SoniNow, we design and implement Stripe integrations that are robust, scalable, and fully customised to your business model.

Subscriptions and Recurring Billing

Stripe's subscription and billing engine is one of its most powerful features, enabling everything from simple monthly plans to complex usage-based pricing.

Product and Price Configuration

We model your pricing structure using Stripe's Products and Prices API. Prices can be:

• Fixed rate — A set amount per interval (e.g., $29/month)
• Tiered — Different rates based on volume (e.g., first 1,000 API calls free, then $0.02/call)
• Usage-based — Billed by metered units (e.g., $0.10 per active user per day)
• Licensed — A flat fee per billing period regardless of usage

We also configure billing intervals (weekly, monthly, quarterly, annual, custom), trial periods, and collection methods (charge automatically or send invoice).

Subscription Lifecycle

Our integration handles the complete subscription lifecycle:

1. Checkout — Customer selects a plan and provides payment details via Stripe Checkout, Payment Element, or Elements.
2. Activation — Stripe creates the subscription, charges the first payment, and we update your database with the subscription ID and status.
3. Invoicing — Stripe generates and emails invoices automatically each cycle, with automatic payment retries (Smart Retries) on failure.
4. Upgrades and Downgrades — Proration logic calculates credits and charges for mid-cycle plan changes. We configure whether changes apply immediately or at the next billing period.
5. Churn Management — Failed payment handling with dunning — Stripe sends up to three automatic email reminders over 14 days before marking the subscription as unpaid.

Incomplete and Past-Due Handling

We monitor subscription status transitions (incomplete, past_due, canceled, unpaid) through webhooks. Our integration automatically notifies customers of payment failures, triggers internal alerts for high-value accounts, and can initiate a PaymentIntent confirm to retry payment with a new or updated payment method.

Checkout and Payment Elements

Stripe provides multiple ways to collect payments, each suited to different integration needs.

Stripe Checkout

Stripe Checkout is a prebuilt, Stripe-hosted payment page that handles the entire payment flow — card entry, address collection, promotions, and redirect. We prefer Checkout for most integrations because:

• It is PCI DSS Level 1 certified out of the box
• It supports 25+ payment methods (cards, Apple Pay, Google Pay, Klarna, Affirm, iDEAL, SEPA, etc.)
• It offers built-in address verification, CVC check, and 3D Secure authentication
• It localises the payment form based on the customer's IP address

Payment Element

For full design control within your own UI, we integrate Stripe Payment Element — a dynamic UI component that adapts to each customer's country, currency, and preferred payment method. The Payment Element renders inside your checkout page, collects payment details, and returns a paymentMethod ID for server-side processing. We handle:

• SCA (Strong Customer Authentication) compliance via automatic 3D Secure triggers
• Reusable payment methods for subscription billing
• Link (Stripe's one-click checkout) auto-enrolment for returning customers

Custom Payment Forms

For the ultimate in control, we build fully custom payment forms using Stripe Elements (Card Element, Card Number Element, etc.) along with confirmPayment() and handleCardAction() for SCA flows.

Webhooks and Event-Driven Processing

Stripe uses webhooks to notify your application of events — payment success, subscription updates, dispute filings, payout failures, and more. A well-designed webhook integration is the key to keeping your system synchronised with Stripe.

Webhook Endpoint Architecture

We configure a secure webhook endpoint (or endpoint per environment) in the Stripe Dashboard, subscribing to relevant event types:

• payment_intent.succeeded, payment_intent.payment_failed, payment_intent.requires_action
• charge.refunded, charge.dispute.created, charge.dispute.closed
• customer.subscription.created, customer.subscription.updated, customer.subscription.deleted
• invoice.paid, invoice.payment_failed

Webhook Signature Verification

Every Stripe webhook includes a signature in the Stripe-Signature header. We use the official Stripe SDK to verify signatures using your endpoint secret — rejecting any request that does not pass verification. This prevents fraudulent webhook injections.

Idempotency and Error Handling

Stripe webhooks may be delivered more than once. Our integration uses Idempotency-Key headers and database-level deduplication (tracking processed webhook IDs) to guarantee exactly-once processing. Failed webhook handling (due to temporary errors) triggers automatic retries — we configure our endpoint to return 200 OK only after successful processing; Stripe will retry non-200 responses.

Business Automation via Webhooks

Webhooks drive real-time business logic. For example:

• On invoice.paid — provision SaaS access, increment usage counters, send receipt
• On customer.subscription.deleted — revoke access, archive data (after grace period)
• On charge.dispute.created — freeze fulfilment, notify support team, retrieve evidence
• On payout.failed — alert finance team, retry with alternative method

PCI Compliance and Security

Stripe's suite of hosted payment components means you never handle raw card data, significantly reducing your PCI compliance burden.

PCI DSS Scope Reduction

By using Stripe Checkout, Payment Element, or Stripe.js + Elements, your servers never receive or transmit card numbers. This makes you eligible for SAE A (Self-Assessment Questionnaire A), the simplest PCI compliance level — just a self-assessment form completed annually. No network scans, no penetration testing, no dedicated compliance infrastructure.

Radar and Fraud Prevention

Stripe Radar uses machine learning to evaluate every payment in real time against billions of data points across Stripe's network. We configure Radar rules specific to your business — blocking high-risk countries, applying rate limits for rapid-fire attempts, requiring 3D Secure for certain thresholds, and creating allowlists for trusted customers. Radar for Fraud Teams provides custom rule builders for advanced fraud management.

Data Encryption and Tokenisation

All card data is tokenised at the client side using Stripe.js — the token or paymentMethod ID is all that touches your server. In-transit encryption (TLS 1.3) and at-rest encryption are managed by Stripe, which maintains PCI DSS Level 1, SOC 1/2/3, and ISO 27001 certifications.

Multi-Currency and International Payments

Stripe processes payments in 135+ currencies. We configure multi-currency pricing, automatic currency conversion at Stripe's competitive rates, and settlement in your primary currency. For European customers, we handle SEPA Direct Debit and iDEAL; for Asian markets, we enable GrabPay, GCash, and Alipay. All with a single integration.

Testing and Go-Live

Stripe's test mode includes 20+ test card numbers that simulate every scenario — successful payment, declined card, insufficient funds, requires authentication, and more. We build automated test suites that cover all flows, then walk through Stripe's integration checklist before the go-live review process. Production keys are deployed only after passing every test.

From a simple donation page to a multi-product subscription platform handling millions in monthly revenue, SoniNow delivers Stripe integrations that are trustworthy, compliant, and built for growth.