Protocol

Payment Handlers

Q: Can a store accept multiple payment methods?

Yes. Stores declare multiple payment handlers in their UCP profile and can dynamically filter available handlers based on cart context. Each handler has a unique handler_id to prevent key confusion when multiple providers are available.

What payment methods do UCP stores support? Payment handlers define how agents pay for goods using tokenized credentials.

Payment handlers are a core building block of the Universal Commerce Protocol. They use a trust triangle between the store, platform, and credential provider to process payments without exposing raw card data. Each handler is declared in the profile with a reverse-domain namespace and works alongside capabilities like checkout and transports to enable end-to-end agent commerce.

Frequently Asked Questions

What are UCP payment handlers?

Payment handlers are specifications in the UCP profile that define how payment instruments are processed. They declare which payment methods a store accepts (e.g., Google Pay, Shopify card payments) along with configuration like accepted card networks and gateway details.

How do payments work in UCP?

UCP uses a trust triangle between the business, platform, and credential provider. The platform obtains a payment token from the provider, then submits the opaque credential to the store. This keeps platforms out of PCI-DSS scope. The AP2 extension adds cryptographic authorization for autonomous agent purchases.

Can a store accept multiple payment methods?

Yes. Stores declare multiple payment handlers in their profile and can dynamically filter available handlers based on cart context. Each handler has a unique handler_id to prevent key confusion when multiple providers are available.

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Weekly UCP Report

Issue #54 · Oct 12, 2026

+664

new verified stores

Verified rate

Latest spec

Cart capability

Payment Handlers

Google Pay

Shopify Card

Shopify Shop Pay

Boutir Payment Bank Transfer

Bareconnect Paystack

Opensource Free

Mock Payment Handler

Stripe Payments

Ucp Redirect

Ucp Payment X402

Example Processor

Ucp Payment Stripe

Stripe

Ucp Delegate Payment

Woocommerce Cod

Firmly Card

Stripe Card

Google Pay

Boutir Payment Customized Pm 4773714718097408

Boutir Payment Customized Pm 4793226351869952

Boutir Payment Customized Pm 4875292598861824

Boutir Payment Customized Pm 4883556292100096

Boutir Payment Customized Pm 4906566243844096

Boutir Payment Customized Pm 5104370727780352

Boutir Payment Customized Pm 6332680069709824

Boutir Payment Customized Pm 6370489464651776

Finqu Hosted Checkout

Ucpsandbox Pay At Property

Fgatrust Offline Arrangement

Terrawallet Store Credit

Ucp Mock Payment

Filtalgo Card

Filtalgo Wallet

Netsgroup Igfs

Woocommerce Txpg

Stripe Spt

Stripe Payment

Grayporter Stripe Spt

Grayporter Card

Klarna Payments

Vibeshop Mock

Ucp Payments Ap2

Zologic Payment Delegate Checkout

Example Processor Tokenizer

Demo Card

Catyai Payment Merchant Checkout

Boutir Payment Customized Pm 4606796292816896

Boutir Payment Customized Pm 4839817824043008

Boutir Payment Customized Pm 5624517467439104

Boutir Payment Customized Pm 5983064753045504

Boutir Payment Customized Pm 4717987666722816

Boutir Payment Customized Pm 6501234840567808

Grooveshop Payments

Ausiafarms Cash On Delivery

Ucp Payment External

Telnyx X402

Scvd Payment Usdc

Universalcommerce Farma X402

Boutir Payment Customized Pm 4569968326082560

Boutir Payment Customized Pm 4999368829960192

Boutir Payment Customized Pm 4579286496182272

Boutir Payment Customized Pm 5807937019576320

Boutir Payment Customized Pm 6553317931876352

Boutir Payment Customized Pm 4785130454253568

Boutir Payment Customized Pm 6084623787229184

Boutir Payment Customized Pm 5249874758336512

Boutir Payment Customized Pm 5276470836854784

Boutir Payment Customized Pm 5302999507664896

Ticketfairy Www Stripe Spt

Boutir Payment Customized Pm 6112227439804416

Boutir Payment Customized Pm 4659617232977920

Boutir Payment Customized Pm 5733636602462208

Boutir Payment Customized Pm 6644471021568000

Boutir Payment Customized Pm 6751921187979264

Vtex Pix

Vtex Boleto

Vtex Card

Ucpplayground Test Card

Cervicaltractions Pay Stripe