Finance as a Native Payment Method
Inside Shopify Checkout
Enabling FCA-regulated retail finance — including 0% interest-free credit, BNPL, and interest-bearing plans — directly within Shopify checkout. No redirects. No friction. Just a seamless finance journey from eligibility check to signed agreement.
Overview
This project involved integrating Capital Retail Finance, a UK-based FCA-regulated retail finance provider, into Shopify as a native payment method. The goal was to allow merchants to offer flexible finance options — including 0% interest-free credit, Buy Now Pay Later (BNPL), and interest-bearing plans — directly within the Shopify checkout experience.
We built a custom Shopify plugin that connects with the Finance REST APIs to handle the full lifecycle — from eligibility checks and credit decisions to agreement signing and order confirmation — all without forcing users to leave the store. Key deliverables included:
- Finance embedded as a native checkout payment option alongside standard Shopify payment methods
- Full credit application journey — eligibility check, credit decision, e-signature, and order confirmation — all in-store
- Support for multiple finance plans: 0% Interest-Free Credit, Buy Now Pay Later, and Interest-Bearing Plans
- Clear instalment breakdowns displayed before the customer proceeds to payment
- Full integration with Shopify webhooks for automated order lifecycle management after approval
- Merchant admin panel for self-service configuration — plan selection, cart thresholds, and API credentials with no developer involvement
The Challenges
No Native Finance Support in Shopify
Shopify does not natively support retail finance as a built-in payment method, and no existing integration was available for Capital Retail Finance. Building this from scratch required deep knowledge of Shopify's payment extension architecture.
- No standard finance payment method in Shopify's ecosystem
- Required a fully custom plugin using Payment Extensions
- Finance plans needed dynamic display based on cart value
Full Credit Application Journey Within Shopify
Managing the complete credit application lifecycle — eligibility check, application, decision, e-signature, and confirmation — inside Shopify's checkout without disrupting the purchase flow.
- Multi-step finance application inside a single checkout session
- State management across eligibility → decision → signature steps
- Session continuity maintained throughout the credit journey
Real-Time Credit Decisions & E-Signatures
Integrating real-time credit decisioning and a paperless e-signature process into the checkout flow — where any delay or failure would directly disrupt the purchase and damage customer trust.
- Real-time API calls to the finance provider during checkout
- Graceful handling of approve, refer, and decline outcomes
- Secure e-signature process without leaving the Shopify store
FCA Compliance Requirements
The integration had to operate in full alignment with FCA (Financial Conduct Authority) regulations — covering secure data handling, consent flows, and the correct pre-checkout presentation of financial information to consumers.
- FCA-compliant disclosure of APR and total payable amounts
- Explicit consent capture before application submission
- Encrypted transmission of all customer financial data
Shopify Order Lifecycle Integration
After finance approval, the Shopify order had to be automatically created, marked as paid, and pushed into fulfillment — requiring reliable webhook integration with Shopify's order management system.
- Automated order creation immediately after agreement completion
- Webhook-driven order status updates and fulfillment triggers
- Idempotent processing to prevent duplicate orders on retries
Eliminating External Redirects
Traditional finance integrations redirect customers to external sites — breaking the checkout flow and reducing conversion rates. The entire finance journey had to remain inside Shopify to protect conversions.
- Finance application fully hosted within the Shopify store
- No third-party page redirects at any stage of checkout
- Consistent brand experience maintained throughout the journey
The core challenge was embedding a complete, FCA-regulated finance application journey natively inside Shopify checkout — handling real-time credit decisions, e-signatures, and automated order creation without any external redirects or checkout disruption.
Our Solution
We designed and built a fully custom Shopify Payment Plugin that embeds Capital Retail Finance's complete credit application, real-time decisioning, and e-signature process natively into Shopify checkout — giving merchants a conversion-optimized, FCA-aligned finance option with zero external redirects.
Custom Shopify Payment Plugin
We built a fully custom plugin that registers Capital Retail Finance as a native payment method within Shopify's checkout — appearing alongside card payments and other standard options — with dynamic finance plan display based on the current cart value.
Finance registered as a native Shopify payment method via Shopify Payment Extensions — appearing naturally in checkout alongside standard options without custom UI workarounds.
Available finance plans are fetched and rendered dynamically based on cart value — only showing plans the customer is eligible to apply for at their current order total.
Clear monthly instalment breakdowns shown before the customer proceeds — displaying total payable, interest rate (if applicable), and plan duration in a compliant, readable format.
A dedicated admin settings panel allows merchants to manage API credentials, select available finance plans, and set cart value thresholds — with no developer involvement required.
End-to-End Finance Journey Integration
The entire finance application lifecycle — from the initial soft eligibility check through to the signed agreement and automatic order confirmation — is handled inside the Shopify store with no external redirects at any stage.
A soft credit search performed before the full application — giving customers an early eligibility indication without impacting their credit score.
Customer details securely submitted to the Finance API. The application is validated and processed in real time against the provider's lending criteria.
The Finance API returns an instant decision — Approved, Referred, or Declined. Each outcome handled with appropriate UI messaging and next-step options.
Approved customers complete a paperless e-signature for the finance agreement — entirely within the store, with no third-party signing platform redirect.
Upon agreement completion, the Shopify order is automatically created, marked as paid, and pushed into the fulfillment workflow — with no manual intervention required.
Finance Plan Display & UX
Finance options are presented clearly and intuitively at checkout, giving customers full visibility of their payment choices before committing — reducing hesitation and improving conversion on high-value orders.
- Monthly instalment breakdowns displayed before the customer proceeds to payment
- 0% Interest-Free Credit — clear display of deferred payment terms and total repayable
- Buy Now Pay Later (BNPL) — short-term deferred payment with no upfront interest cost
- Interest-Bearing Plans — longer-term finance with APR clearly disclosed
- Plans filtered dynamically by cart value — only eligible options presented
- FCA-compliant representative APR and total cost disclosed at the point of selection
API & Webhook Integration
The plugin is fully API-driven — connecting to Capital Retail Finance's REST API for all finance operations, while Shopify webhooks handle post-approval order automation.
Full integration with the Capital Retail Finance REST API — covering eligibility checks, application submission, credit decision retrieval, and agreement status polling.
Shopify webhooks configured to receive order status events — enabling automated order creation, payment marking, and fulfillment triggering immediately after finance agreement completion.
Webhook processing built with idempotency keys to prevent duplicate order creation on retry events — ensuring data integrity across the approval → order creation workflow.
Merchant Configuration Panel
A dedicated merchant admin panel removes any developer dependency for day-to-day operation. Merchants can configure, adjust, and manage the finance integration directly from their Shopify admin.
- API credentials management — securely stored and editable from the admin panel
- Finance plan selection — enable or disable specific plan types per merchant preference
- Minimum and maximum cart value thresholds — control which orders are eligible for finance
- Live/test mode toggle for safe testing without affecting live orders
- All configuration changes take effect without plugin redeployment
System Architecture
The integration is structured across six clearly defined layers — ensuring clean separation between the customer-facing UI, payment orchestration, finance API communication, and order automation.
Frontend Layer
Shopify Liquid templates and JavaScript handle all UI interactions — rendering finance plan options, instalment breakdowns, and application status messaging within the native Shopify checkout flow.
Backend Plugin
PHP-based plugin handles all API orchestration — managing authentication, request formatting, response parsing, and error handling between Shopify and the Capital Retail Finance REST API.
Payments Layer
Shopify Payment Extensions used to register finance as a native, selectable payment method within Shopify's standard payment selection step — no custom workarounds required.
Integration Layer
Capital Retail Finance REST APIs used for all finance operations: eligibility checks, application submission, real-time credit decisions, e-signature management, and agreement status updates.
Data Layer
MySQL database stores transaction logs, application states, merchant configuration, and API credentials — providing a reliable audit trail and enabling status recovery on connection failures.
Event Handling
Shopify Webhooks automate the post-approval order lifecycle — triggering order creation, payment marking, and fulfillment dispatch upon successful finance agreement completion.
Results & Impact
Finance embedded in Shopify checkout
External redirects during checkout
Real-time credit decisions at checkout
Conversion on high-value orders
Compliant regulated finance integration
API-driven finance lifecycle automation
Business Impact
Finance available directly in checkout — customers experience a seamless, uninterrupted purchase journey from product selection to signed finance agreement
Zero external redirects — the entire credit application, decision, and e-signature process completed within the Shopify store, preserving brand experience and reducing abandonment
Merchants can now offer FCA-regulated 0% interest-free credit, BNPL, and interest-bearing plans — opening high-value orders to customers who would otherwise abandon at payment
Fully automated order processing after finance approval — orders created, paid, and pushed into fulfillment instantly with no manual steps required from the merchant
Self-service merchant configuration panel eliminates developer dependency for day-to-day finance settings — merchants manage plans, thresholds, and credentials independently
Complete API-driven finance lifecycle — stable, reliable, and fully aligned with Shopify's ecosystem standards and Capital Retail Finance's platform requirements
Technology Stack
Final Outcome
Before
- No finance payment option available at Shopify checkout
- Customers redirected off-site for finance applications
- No native credit decision or e-signature flow in-store
- Manual order processing required after finance approval
- No FCA-compliant finance checkout integration for Shopify
After
- Finance embedded natively as a Shopify payment method
- Zero redirects — complete journey inside the store
- Real-time credit decisions and seamless e-signature at checkout
- Automated order creation and fulfillment after approval
- Fully FCA-aligned, API-driven payment workflow on Shopify
This solution successfully bridges the gap between retail finance and Shopify's checkout experience — enabling merchants to offer flexible, FCA-regulated payment options without compromising user experience or compliance. It transforms finance from an external, conversion-killing process into a fully embedded, seamlessly automated payment method that works natively inside Shopify.
Want to Add Custom Payment Methods or Finance Options to Shopify?
Let's build a seamless checkout experience tailored to your business. Whether you need retail finance, BNPL, or a completely custom payment flow — we have the expertise to integrate it cleanly inside Shopify.
Contact Us to Discuss Your ProjectFrequently Asked Questions
Yes — through Shopify Payment Extensions, it is possible to register fully custom payment methods that appear natively alongside Shopify's standard payment options at checkout. This is exactly how Capital Retail Finance was integrated: as a first-class Shopify payment method, with no custom UI hacks or workarounds.
The key is building a proper Shopify-compatible plugin that handles authentication, plan display, and the full payment lifecycle in alignment with Shopify's extension architecture — ensuring a stable, upgrade-resistant integration.
When a customer selects finance and submits their application, the plugin securely sends their details to the Capital Retail Finance REST API. The API processes the application against the provider's lending criteria and returns an instant decision — Approved, Referred, or Declined — within seconds.
Each outcome is handled gracefully: approved customers proceed to the e-signature step, referred cases are managed with appropriate messaging, and declined customers are presented with alternative payment options — all without leaving the Shopify checkout.
Buy Now Pay Later (BNPL) allows customers to purchase products immediately and pay later — typically in a series of instalments or as a single deferred payment — often with no interest. In the context of retail finance, BNPL is a regulated product subject to FCA oversight, distinct from unregulated short-term solutions.
In this integration, BNPL is offered as one of several available finance plans and is governed by the same eligibility check, credit decision, and e-signature process as other finance products — ensuring full regulatory compliance and consumer protection throughout.
Yes — the integration is built around Capital Retail Finance, an FCA-regulated provider. The finance application, decisioning, and e-signature processes are handled by the provider's regulated platform via their REST APIs. The plugin's role is to facilitate secure communication, present financial information correctly, and automate post-approval order processing.
Key compliance considerations built into the integration include: encrypted transmission of customer data, correct pre-checkout disclosure of representative APR and total payable amounts, explicit consent capture before application submission, and an optional soft credit search before the full application is made.
No — once the finance agreement is completed and approved, the order flows through Shopify's standard order management and fulfillment system exactly as it would for any other payment method. The plugin handles the finance-specific layer (application, decision, signing) and then creates the Shopify order automatically via webhooks once approval is confirmed.
This means merchants see finance-approved orders in their Shopify admin like any other order — with normal fulfillment, shipping notifications, and order history — with no separate workflow required for finance orders.