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Build on Square APIs for payments, inventory, and order management

The official Xero MCP server (@xeroapi/xero-mcp-server) that lets AI assistants work with a Xero accounting organisation — managing contacts, chart of accounts, invoices, credit notes, payments, bank transactions, manual journals, quotes, items, and payroll, and reading financial reports — using Xero OAuth2 custom connections or a bearer token.

Automate payments, orders, refunds, settlements, and Razorpay checkout integrations from Claude with the official Razorpay MCP Server — hosted remotely at mcp.razorpay.com or self-hosted, covering 40+ payment API tools for South Asia's leading payments platform.

Integrate PayPal commerce capabilities, payment processing, and transaction management

Payment processing, subscription management, and financial transaction handling

The official Paddle MCP server (@paddle/paddle-mcp) that lets AI assistants work with Paddle Billing — managing the product catalog, prices, and discounts, customers and businesses, subscriptions, transactions and adjustments, and financial reports — over the Paddle API, with sandbox or production environments and a read-only / non-destructive / all tool-permission filter.

Integrate with Adyen's payment platform from Claude — create payment sessions and links, cancel/refund payments, manage terminals, webhooks, API credentials, and merchant accounts — with the official Adyen Model Context Protocol server covering Checkout and Management APIs.

AT Directory hosted MCP server for discovering Observer Protocol–verified merchants accepting Lightning, BOLT12, L402, and USDT agentic payments with live rail verification.

A source-backed Model Context Protocol starter collection for SaaS builders: connect product code, database state, payments, deployment telemetry, issue tracking, and production errors while keeping MCP authorization and tool boundaries explicit.