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Jerkmate
https://www.shipstation.com/fulfillment/api/checkout/
Checkout API for Flexible Shipping Options | ShipStation
Apr 27, 2026 - Integrate ShipStation’s Checkout API to support flexible payment methods and custom page URLs, simplifying checkout and improving the customer experience.
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https://docs.alternativepayments.io/
Introduction | Hosted Checkout API Documentation
hosted checkoutapi documentationintroduction
https://violet.io/privacy-policy
Violet - The Unified Checkout API
Violet's Unified Checkout API makes it easy to create seamless checkout experiences connected to any merchant on any ecommerce platform.
unified checkoutvioletapi
https://xenforo.com/community/threads/introducing-stripe-checkout-paypals-rest-api-and-more.220349/
XF 2.3 - Introducing Stripe Checkout, PayPal's REST API and more! | XenForo community
Brand new in XenForo 2.3.0 Beta 2 is support for a few long overdue enhancements related to our payment and purchasable system. Let's look at each of these...
xf 2 3stripe checkoutrest apixenforo communityintroducing
https://rye.com/pricing
Rye Pricing — Agentic Commerce API for Product Data & Checkout
Discover Rye's pricing plans for agentic commerce — from product data to universal checkout. Built for developers and AI apps.
agentic commerceproduct dataryepricingapi