Marketplace Pulse: Shopify is warning its merchants not to use Amazon's checkout service Buy with Prime, saying it is a security risk and violates Shopify's ToS
Context & Ripple Effects
This is the checkout layer of the Amazon–Shopify war turning hot. Amazon first courted Shopify as a partner with the Pay with Amazon platform-integration program in 2016, then pivoted with Buy with Prime, which analysts argued was designed to deepen Amazon's logistics moat and starve Shopify's own shipping build-out (Stratechery's analysis). Shopify's warning reframes that competitive threat as a security and compliance issue.
The dependency runs both ways, which is what makes the standoff sharp: back in 2015 Amazon itself shut down its Webstore and steered merchants to Shopify, and Amazon later formalized a truce of sorts with an official Buy with Prime app for Shopify stores. A warning issued between those two points shows Shopify asserting gatekeeper control over which rival services merchants may embed.
First-order effects
- Shopify merchants face a direct compliance choice: adopting Buy with Prime puts their store in violation of Shopify's Terms of Service, exposing them to enforcement, while declining means giving up Amazon's checkout conversion and Prime-member trust signals.
- Amazon's push to place its checkout inside Shopify stores now runs through merchant-by-merchant persuasion rather than platform approval, since Shopify has formally withheld that approval.
Second-order effects
- The warning raises the stakes on Shopify's own fulfillment and shipping ambitions — the exact capability Buy with Prime was built to undercut — pressuring Shopify to make its logistics offering credible enough that merchants don't defect to Amazon's.
- Shopify Payments and Shopify's checkout data are the revenue and data layers at risk; every merchant who routes checkout through Amazon shifts payment economics and shopper relationships off Shopify's platform.
Third-order effects
- If platforms increasingly police rival embedded services under ToS and security framing, merchant tooling consolidates around whatever the platform owner permits — a structural shift toward walled-garden checkout, with regulators' interest in self-preferencing (already visible in Amazon's own antitrust lobbying toward merchants) likely to grow.
- The episode shows e-commerce infrastructure consolidating into two poles — Amazon's logistics-and-checkout stack versus Shopify's merchant-platform stack — forcing merchants to pick an ecosystem rather than mix best-of-breed services.
The trend: E-commerce platforms are tightening control over which rival services merchants may embed, as Amazon and Shopify compete to own the checkout, payments, and fulfillment layer.