MCP servers · Square · MCP server + skill
Connect Claude Code to Square
One line gives Claude Code your Square account as tools: 57 endpoints, payments, customers, orders, called with your own connection. No key in the prompt, a receipt for every call, revoke Claude Code's access alone any time.
Three steps
- Create a free 0n3 account and connect Square. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into Claude Code. The terminal agent. One command, then every connection you hold is a tool in your shell. The skill file teaches it how 0n3 works.
- Ask Claude Code: whoami. Then: "Create a payment in Square".
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"
The line above carries a placeholder; 0n3.app/install mints a real key named for Claude Code and fills it in.
What Claude Code can then do in Square
Payments · Process payments, refunds, and completions4
Create a payment
POST /paymentsList payments
GET /paymentsGet a payment
GET /payments/{paymentId}Complete a payment
POST /payments/{paymentId}/completeCustomers · Full customer directory management6
Create a customer
POST /customersList customers
GET /customersGet a customer
GET /customers/{customerId}Update a customer
PUT /customers/{customerId}Delete a customer
DELETE /customers/{customerId}Search customers
POST /customers/searchOrders · Create, manage, and pay orders5
Create an order
POST /ordersSearch orders
POST /orders/searchGet an order
GET /orders/{orderId}Update an order
PUT /orders/{orderId}Pay an order
POST /orders/{orderId}/payCatalog · Product catalog lifecycle5
Create a catalog object
POST /catalog/objectList catalog
GET /catalog/listSearch catalog
POST /catalog/searchUpdate a catalog object
POST /catalog/objectDelete a catalog object
DELETE /catalog/object/{objectId}Inventory · Inventory tracking and transfers3
Get an inventory
POST /inventory/counts/batch-retrieveAdjust inventory
POST /inventory/changes/batch-createTransfer inventory
POST /inventory/transfers/batch-createInvoices · Create and send invoices6
Create an invoice
POST /invoicesList invoices
GET /invoicesGet an invoice
GET /invoices/{invoiceId}Update an invoice
PUT /invoices/{invoiceId}Publish an invoice
POST /invoices/{invoiceId}/publishCancel an invoice
POST /invoices/{invoiceId}/cancelSquare in other AI clients
Claude (desktop & claude.ai) + SquareconnectorChatGPT + Squareconnector · GPT actionCodex CLI + SquareMCP serverGemini CLI + SquareMCP serverCursor + SquareMCP serverVS Code (Copilot) + SquareMCP serverWindsurf + SquareMCP server