Integration · Payments
Connect Claude & ChatGPT to Stax
Ask your AI which invoices are still open, what a customer paid last month, or to create a payment link in Stax. It can search customers, invoices, transactions and catalog items, list deposits and chargeback disputes, and email invoices and receipts. Payment questions get answered without clicking through the Stax dashboard.
Free plan, no credit card. Takes about a minute.
Try asking
“Find the customer Jane Miller at Harbor Bakery and show her recent payments.”
The AI searches customers by name and company, then lists her transactions with amount, status and payment method.
“Create a $250 invoice for customer Harbor Bakery.”
It finds the customer ID and creates the invoice with the total. The invoice is not sent until you ask.
“Email invoice 8f21 to the customer and copy [email protected].”
It sends the invoice email to the customer with the extra address on copy. The email goes out immediately.
What your AI can do
Customers and invoices
Search, create and update customers, create and look up invoices, email them to customers and see scheduled recurring invoices.
Transactions and refunds
Search and read transactions, email receipts, refund a settled transaction, and list deposits and disputes.
Payment links and catalog
Create, update and switch off payment links, and manage catalog items with price, code and stock.
“Make a payment link called Workshop deposit for $100.”
It creates a shareable payment link with that name and a fixed amount.
“Which deposits reached our bank between March 1 and March 15?”
It lists the bank deposits (payouts) in that date range.
“Do we have any open chargeback disputes?”
It lists disputes filtered by status, with the related transaction for each one.
27 tools for Stax
These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.
create_catalog_itemChanges dataCreate a catalog item with its name in `item`, plus optional `price`, `code`, `quantity`, description and tax or service flags.create_customerChanges dataCreate a customer with first and last name, email, phone, company, address and internal notes. At least a name, email or company is needed; search first to avoid duplicates.create_invoiceChanges dataCreate an invoice for a customer with `customer_id`, `total` and optional line items, tax and memo in `meta`; leave `url` at its default Stax bill-pay page. This does not send it.create_payment_linkChanges dataCreate a shareable payment link with a `common_name`, the `url` where your payment page is hosted, and an optional fixed `amount` (0 lets the payer enter it).delete_invoiceDeletesDelete an invoice by `invoice_id`. This cannot be undone.get_catalog_itemGet one catalog item by `product_id`, with price and stock.get_current_userGet the signed-in Stax user and their merchant team (company name, contact details). Use to confirm which account you are working in.get_customerGet one customer by `customer_id`, including contact details, address and notes.get_invoiceGet one invoice by `invoice_id`, with total, status, customer and payment details.get_payment_linkGet one payment link by `payment_link_id`, including amount and whether it is active.get_transactionGet one transaction by `payment_id`, with amount, status, payment method and customer.list_customer_payment_methodsList a customer's saved cards and bank accounts by `customer_id` (masked details only).list_daily_salesGet daily sales totals between `start_date` and `end_date` (YYYY-MM-DD).list_depositsList bank deposits (payouts) between `start_date` and `end_date` (YYYY-MM-DD HH:mm:ss).list_disputesList chargeback disputes, filtered by `status`, `reason`, `transaction_id` or date range.list_invoice_schedulesList scheduled (recurring) invoices, optionally for one `customer_id`, sorted by next or last run date.refund_transactionMoves moneyRefund a settled transaction by `transaction_id` for the given `total`. Money is returned to the customer and this cannot be undone.search_catalog_itemsList catalog items, filtered by `name`, `code`, `price`, `is_active`, `is_service` or `is_taxable`.search_customersFind customers by `firstname`, `lastname`, `email`, `company`, `phone` or free-text `keywords`. Use this to find a customer's ID before other lookups.search_invoicesFind invoices by `keywords`, customer `name`, `email`, `company_name`, `schedule_id` or invoice `id`. Use to find unpaid or recent invoices.search_payment_linksList payment links, filtered by `active` or `keywords` (name, amount).search_transactionsList and filter transactions (payments) by `customer_id`, date range, `type` (charge, refund, void and more), `keywords`, amount or success.send_invoice_emailDeletesEmail an invoice to its customer by `invoice_id`, optionally copying extra addresses in `cc_emails`. The email is sent immediately.send_receipt_emailDeletesEmail the receipt for a transaction by `transaction_id`, optionally to extra addresses in `cc_emails`. The email is sent immediately.update_catalog_itemChanges dataUpdate a catalog item's name, price, code, category, stock or flags by `product_id`. Only the fields you pass change.update_customerChanges dataUpdate a customer's name, email, phone, company, address or notes by `customer_id`. Only the fields you pass change.update_payment_linkChanges dataUpdate or deactivate a payment link by `payment_link_id` (set `active` false to switch it off); `url` and `common_name` are required.
Set up in three steps
- 1
Pick the app
Create a free PipMCP account and choose Stax from the app list.
- 2
Paste your key
Paste your Stax merchant API key. In Stax Pay, click Apps in the side menu, open API Keys and click Launch. Click New Key, give it a name and a role, and save. Then click the key icon next to it to view and copy the key.
- 3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
- Click your name, then Settings › Connectors › Add custom connector.
- Paste your link as the Remote MCP server URL.
- Switch it on from the + menu in a chat.
Questions
What can the AI do in Stax?
The AI can read customers, saved payment methods (masked), invoices, scheduled invoices, transactions, payment links, catalog items, deposits and disputes. It can create and update customers, invoices, payment links and catalog items, email invoices and receipts, and refund a transaction if you switch those tools on.
Does the AI see my Stax API key?
No. Your Stax API key is encrypted at rest and never shown to the AI. After you save it, it is not shown again, not even to you. The AI only sees the results of the tools it calls.
Can I control what the AI is allowed to do?
Yes. You choose which tools are switched on, so you can start with lookups only. Refunding a transaction returns money and cannot be undone, and emailing invoices or receipts reaches your customers right away. These actions can require your approval before they run. Every tool call is logged.
Does it work with ChatGPT?
Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your PipMCP link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.
What does it cost?
PipMCP has a free plan with no credit card required. Paid plans bill per completed task. You also need your own Stax account, and anything Stax charges is between you and Stax.
Can the AI take a new card payment in Stax?
No. There is no tool for charging a card. The AI can create invoices and payment links that your customer pays themselves, and it can refund a settled transaction. Saved cards and bank accounts are only shown with masked details.
Let your AI work in Stax today.
Start free. Your key stays encrypted, and you decide what the AI may do.
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