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Support for small merchants: reads customer emails, checks orders and refunds in Stripe, PayPal, Square or Shopify, and drafts replies in the owner's voice per your refund policy; can refund via Stripe or Square after explicit approval. Works with pasted emails too. Official from Anthropic.

Stripe's official plugin: bundles the remote Stripe MCP with skills for integration best practices, Connect, Stripe Apps and API upgrades, plus commands that explain errors and list test card numbers. Available in the official Claude and Codex marketplaces.

Official MCP from Razorpay, the Indian payments platform: query payments, orders, refunds, settlements and reconciliation reports, and create payment links and QR codes. The hosted remote server is recommended; generate a merchant token from your API key and secret.

PayPal's official agent toolkit, including the @paypal/mcp server: create and send invoices, handle orders and refunds, manage disputes, subscriptions, product catalogs and shipment tracking, and look up transactions. Needs a PayPal developer access token; defaults to the sandbox.

Official MCP (beta) from payments and POS platform Square: lets agents query and manage transactions, orders, refunds, invoices, inventory and customers for reconciliation and reporting. Hosted, with Square OAuth sign-in, nothing to install; confirm refunds and other writes manually.