shop.dev
Shop’s developer playground for product discovery, carts and agent commerce.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 10 · Act 7 · Transact 5 · Score: Not yet scored
Tool inspector
complete_checkout
Send user-approved payment to the same shop/exact checkout ID with one exact offered instrument selected:true. Only completed + order proves purchase. After uncertainty, read get_checkout; never repeat completion or start a replacement purchase.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
checkout |
object | yes | — |
id |
string | yes | — |
meta |
object | no | — |
shop |
string | yes | Exact seller.domain storefront hostname from offer; no scheme/path; one seller per cart/checkout. |
Raw JSON schema
{
"$defs": {
"d0": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": true,
"name": "dev.ucp.shopping.checkout",
"properties": {
"payment": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"description": "Only after shopper selects an instrument.",
"properties": {
"instruments": {
"items": {
"allOf": [
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": true,
"properties": {
"billing_address": {
"properties": {
"address_country": {
"description": "ISO 3166-1 alpha-2, e.g. US.",
"type": "string"
},
"address_locality": {
"type": "string"
},
"address_region": {
"type": "string"
},
"extended_address": {
"type": "string"
},
"first_name": {
"type": "string"
},
"last_name": {
"type": "string"
},
"phone_number": {
"type": "string"
},
"postal_code": {
"type": "string"
},
"street_address": {
"type": "string"
}
},
"title": "Postal Address",
"type": "object"
},
"credential": {
"additionalProperties": true,
"description": "Shape defined by the handler.",
"properties": {
"type": {
"description": "Type the handler requires.",
"type": "string"
}
},
"required": [
"type"
],
"title": "Payment Credential",
"type": "object"
},
"display": {
"type": "object"
},
"handler_id": {
"description": "Merchant-advertised handler ID.",
"type": "string"
},
"id": {
"description": "Opaque; never reuse across merchants.",
"type": "string"
},
"type": {
"description": "Handler category, e.g. card.",
"type": "string"
}
},
"required": [
"id",
"handler_id",
"type"
],
"title": "Payment Instrument",
"type": "object"
},
{
"properties": {
"selected": {
"description": "True only on the one shopper-approved instrument.",
"type": "boolean"
}
},
"type": "object"
}
],
"title": "Selected Payment Instrument"
},
"type": "array"
}
},
"title": "Payment",
"type": "object"
},
"signals": {
"additionalProperties": true,
"description": "Observed/verified platform facts; no buyer claims.",
"properties": {
"dev.ucp.buyer_ip": {
"type": "string"
},
"dev.ucp.user_agent": {
"type": "string"
}
},
"propertyNames": {
"allOf": [
{
"description": "Reverse domain, 2+ segments.",
"examples": [
"dev.ucp.shopping.checkout",
"dev.ucp.common.identity_linking",
"com.example.loyalty_gold",
"com.example-shop.checkout",
"com.2example.cart",
"uk.co.example-shop.checkout",
"xn--p1ai.example.checkout"
],
"pattern": "^[a-z](?:[a-z0-9-]*[a-z0-9])?(?:\\.[a-z0-9](?:[a-z0-9_-]*[a-z0-9_])?)+$",
"title": "Reverse Domain Name",
"type": "string"
}
]
},
"title": "Signals",
"type": "object"
}
},
"required": [
"payment"
],
"title": "Checkout",
"type": "object",
"version": "2026-08-25"
}
},
"properties": {
"checkout": {
"allOf": [
{
"allOf": [
{
"$ref": "#/$defs/d0"
},
{
"properties": {},
"type": "object"
}
],
"title": "Checkout with Discount"
},
{
"allOf": [
{
"$ref": "#/$defs/d0"
},
{
"properties": {},
"type": "object"
}
],
"title": "Checkout with Fulfillment"
},
{
"not": {
"required": [
"attribution"
]
}
}
],
"type": "object"
},
"id": {
"type": "string"
},
"meta": {
"properties": {
"idempotency-key": {
"description": "UUID for one write; reuse for exact retries. complete_checkout derives if omitted.",
"format": "uuid",
"type": "string"
}
},
"type": "object"
},
"shop": {
"description": "Exact seller.domain storefront hostname from offer; no scheme/path; one seller per cart/checkout.",
"minLength": 1,
"type": "string"
}
},
"required": [
"id",
"checkout",
"shop"
],
"type": "object"
}
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