Integrations

Built on Stripe + the latest Shopify.

MerchantLayer apps run inside Shopify's newest infrastructure (Cart Transform, Validation, Theme App Extensions) and use Stripe as the PCI boundary for all money movement. No middleware. No checkout replacement.

Payments

Stripe

Stripe Connect handles all money movement for PayLayer and FinanceLayer. ACH charges land directly in your Stripe account. We never touch the funds.

PayLayerFinanceLayer
Banking

Stripe Financial Connections

Bank account linking and ACH authorization for the customer payment flow. Your customer logs into their bank — credentials never touch our servers. 12,000+ US financial institutions supported.

PayLayerFinanceLayer
Shopify

Shopify Admin (App Bridge)

Every MerchantLayer app embeds in Shopify Admin using App Bridge and Polaris. No external dashboard to learn — manage everything from inside Shopify.

FeeLayerPayLayerFinanceLayer

Shopify Cart Transform Functions

Server-side fee injection that runs inside Shopify's checkout infrastructure as a WebAssembly function. The first enforcement layer for FeeLayer surcharges.

FeeLayer

Shopify Checkout Validation Functions

The second enforcement layer. Rejects orders where totals have been tampered with after Cart Transform. Combined, these two Functions make FeeLayer bypass-proof on Shop Pay, Apple Pay, and Google Pay.

FeeLayer

Shopify Theme App Extensions

Storefront fee disclosure component that adds itself to your theme without touching theme code. Upgrade-safe — no Asset API, no liquid edits.

FeeLayer

Shopify POS

Same fee rules at the register as online. Fee Engine settings flow from FeeLayer admin into the POS via metafields.

FeeLayer

Shopify Flow

Each app emits Flow triggers (fee_collected, ach_settled, plan_late) so you can wire automations without writing code.

FeeLayerPayLayerFinanceLayer

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We add new integrations based on customer demand. Tell us what you need to wire MerchantLayer into.

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