Order links - Sendpaper

Some agents can’t call MCP tools or HTTP APIs, but they can open web pages. An order link puts the whole order in one URL. Opening it shows the exact print preview and a single Pay button. Nothing is ordered until Pay is clicked.

https://sendmypaper.com/quick?type=postcard&size=4x6
  &headline=Happy%20birthday%2C%20Mom!&theme=sunset
  &message=I'll%20call%20you%20Sunday.
  &to_name=Dana%20Kim&to_line1=12%20Oak%20St&to_city=Austin&to_state=TX&to_zip=78701
  &from_name=Alex%20Kim&from_line1=88%20Pine%20Ave&from_city=Denver&from_state=CO&from_zip=80202

(Shown on several lines for reading. It’s one URL, with values URL-encoded.)

Parameters

Parameter	Meaning
`type`	`postcard` (default) or `letter`
`size`	Postcards: `4x6` (default) or `6x9`
`headline` / `image`	Postcard front: big text, or an https photo URL
`theme`	Text fronts: `ink`, `sky`, `sunset`, `forest`
`message`	Postcard back, up to 600 characters
`body`	Letter text; use `%0A%0A` (blank line) between paragraphs
`font`	Letters: `serif` or `sans`
`to_name`, `to_line1`, `to_line2`, `to_city`, `to_state`, `to_zip`	Recipient (US)
`from_…` (same fields)	Return address, required
`email`	Optional, for the receipt

What happens

Open the link: the preview, addresses and price are shown. If something is missing, the page lists which parameters to fix, and nothing is ordered.
Click Pay: the order is created and Stripe Checkout opens. Cards, Link and Apple Pay all work. The same page can’t create two orders.
Paid: a person reviews it, and we print and mail it within one business day.

If your agent can call tools, the MCP server is faster and can pay for you. Order links are the fallback for browser-only agents.