shop.dev
shop.dev
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imperative implementation
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
create_checkout
transact
imperative
May require confirmation
Prepare Shop/UCP checkout only when asked. No separate spend request is needed. Use exact variant IDs/quantities. Share continue_url unchanged for Review and pay, including requires_escalation. Never recreate: get/update its ID. Address incomplete via update. Complete ready_for_complete only after buyer approval. Creates no order.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
checkout |
object | 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": {
"buyer": {
"additionalProperties": true,
"properties": {
"email": {
"type": "string"
},
"first_name": {
"type": "string"
},
"last_name": {
"type": "string"
},
"phone_number": {
"description": "Buyer phone in E.164.",
"type": "string"
}
},
"title": "Buyer",
"type": "object"
},
"context": {
"additionalProperties": true,
"allOf": [
{
"additionalProperties": true,
"description": "Coarse locality; not an address.",
"properties": {
"address_country": {
"description": "ISO 3166-1 alpha-2, e.g. US.",
"type": "string"
},
"address_region": {
"type": "string"
},
"postal_code": {
"type": "string"
}
},
"title": "Locality",
"type": "object"
},
{
"additionalProperties": true,
"properties": {
"currency": {
"description": "ISO 4217 preference/filter currency; verify output.",
"type": "string"
},
"eligibility": {
"description": "Nonidentifying reverse-domain benefits; ignore unknowns.",
"items": {
"$ref": "#/$defs/d10"
},
"type": "array",
"uniqueItems": true
},
"intent": {
"description": "Relevance hint, e.g. 'gift under $50'.",
"type": "string"
},
"language": {
"description": "BCP 47 preference, e.g. fr-CA.",
"type": "string"
},
"location": {
"description": "Opaque merchant location ID, not locality.",
"type": "string"
},
"payment": {
"description": "Advertised handlers, most preferred first; ignore unknowns.",
"items": {
"properties": {
"handler": {
"allOf": [
{
"$ref": "#/$defs/d10"
}
],
"description": "Merchant ucp.payment_handlers key."
},
"types": {
"description": "Instrument types, most preferred first; ignore unknowns.",
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"handler"
],
"type": "object"
},
"type": "array"
}
},
"type": "object"
}
],
"description": "Soft relevance/localization; checkout wins.",
"title": "Context",
"type": "object"
},
"line_items": {
"description": "On update send every line; omissions delete, never merge.",
"items": {
"description": "Uses parent cart/checkout currency.",
"properties": {
"item": {
"properties": {
"id": {
"description": "Copy exact returned variant ID; never rebuild/truncate.",
"type": "string"
},
"quantity_unit": {
"allOf": [
{
"allOf": [
{
"if": {
"properties": {
"unit": {
"const": "C62"
}
},
"required": [
"unit"
]
},
"properties": {
"display_text": {
"description": "Printable label for unrecognized units.",
"type": "string"
},
"scale": {
"default": 0,
"description": "One step = 10^-scale units; omitted=0; C62 needs 0.",
"maximum": 15,
"minimum": 0,
"type": "integer"
},
"unit": {
"description": "UN/CEFACT Rec 20 code, else stable opaque custom ID.",
"type": "string"
}
},
"required": [
"unit",
"display_text"
],
"then": {
"properties": {
"scale": {
"const": 0
}
}
},
"title": "Unit",
"type": "object"
},
{
"properties": {
"increment": {
"default": 1,
"description": "Step multiple (default 1); merchant may revise/reject, never reinterpret.",
"minimum": 1,
"type": "integer"
}
},
"type": "object"
}
],
"description": "Sale basis is unit+scale, not display_text/increment.",
"title": "Quantity Unit"
}
],
"description": "Omit for merchant basis; else assert unit/scale. C62/0 = each."
}
},
"required": [
"id"
],
"title": "Item",
"type": "object"
},
"quantity": {
"description": "Integer sale-basis steps; missing quantity_unit is not each.",
"maximum": 9007199254740991,
"minimum": 1,
"type": "integer"
}
},
"required": [
"item",
"quantity"
],
"title": "Line Item",
"type": "object"
},
"type": "array"
},
"payment": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"description": "Only after shopper selects an instrument.",
"properties": {
"instruments": {
"items": {
"allOf": [
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": true,
"properties": {
"billing_address": {
"properties": {
"address_country": {
"$ref": "#/$defs/d1"
},
"address_locality": {
"$ref": "#/$defs/d2"
},
"address_region": {
"$ref": "#/$defs/d3"
},
"extended_address": {
"$ref": "#/$defs/d4"
},
"first_name": {
"$ref": "#/$defs/d5"
},
"last_name": {
"$ref": "#/$defs/d6"
},
"phone_number": {
"$ref": "#/$defs/d7"
},
"postal_code": {
"$ref": "#/$defs/d8"
},
"street_address": {
"$ref": "#/$defs/d9"
}
},
"title": "Postal Address",
"type": "object"
},
"credential": {
"additionalProperties": true,
"description": "Shape defined by the handler.",
"properties": {
"type": {
"description": "Type the handler requires.",
"type": "string"
}
},
"required": [
"type"
],
"title": "Payment Credential",
"type": "object"
},
"display": {
"type": "object"
},
"handler_id": {
"description": "Merchant-advertised handler ID.",
"type": "string"
},
"id": {
"description": "Opaque; never reuse across merchants.",
"type": "string"
},
"type": {
"description": "Handler category, e.g. card.",
"type": "string"
}
},
"required": [
"id",
"handler_id",
"type"
],
"title": "Payment Instrument",
"type": "object"
},
{
"properties": {
"selected": {
"description": "True only on the one shopper-approved instrument.",
"type": "boolean"
}
},
"type": "object"
}
],
"title": "Selected Payment Instrument"
},
"type": "array"
}
},
"title": "Payment",
"type": "object"
},
"signals": {
"additionalProperties": true,
"description": "Observed/verified platform facts; no buyer claims.",
"properties": {
"dev.ucp.buyer_ip": {
"type": "string"
},
"dev.ucp.user_agent": {
"type": "string"
}
},
"propertyNames": {
"allOf": [
{
"$ref": "#/$defs/d10"
}
]
},
"title": "Signals",
"type": "object"
}
},
"required": [
"line_items"
],
"title": "Checkout",
"type": "object",
"version": "2026-08-25"
},
"d1": {
"description": "ISO 3166-1 alpha-2, e.g. US.",
"type": "string"
},
"d10": {
"description": "Reverse domain, 2+ segments.",
"examples": [
"dev.ucp.shopping.checkout",
"dev.ucp.common.identity_linking",
"com.example.loyalty_gold",
"com.example-shop.checkout",
"com.2example.cart",
"uk.co.example-shop.checkout",
"xn--p1ai.example.checkout"
],
"pattern": "^[a-z](?:[a-z0-9-]*[a-z0-9])?(?:\\.[a-z0-9](?:[a-z0-9_-]*[a-z0-9_])?)+$",
"title": "Reverse Domain Name",
"type": "string"
},
"d2": {
"type": "string"
},
"d3": {
"type": "string"
},
"d4": {
"type": "string"
},
"d5": {
"type": "string"
},
"d6": {
"type": "string"
},
"d7": {
"type": "string"
},
"d8": {
"type": "string"
},
"d9": {
"type": "string"
}
},
"properties": {
"checkout": {
"allOf": [
{
"allOf": [
{
"$ref": "#/$defs/d0"
},
{
"properties": {
"discounts": {
"properties": {
"codes": {
"description": "Replace case-insensitively; [] clears all.",
"items": {
"type": "string"
},
"type": "array"
}
},
"type": "object"
}
},
"type": "object"
}
],
"title": "Checkout with Discount"
},
{
"allOf": [
{
"$ref": "#/$defs/d0"
},
{
"properties": {
"fulfillment": {
"allOf": [
{
"properties": {
"methods": {
"description": "Methods covering the checkout's line items.",
"items": {
"allOf": [
{
"if": {
"properties": {
"type": {
"const": "shipping"
}
},
"required": [
"type"
]
},
"then": {
"properties": {
"destinations": {
"description": "Platform-authored shipping addresses.",
"items": {
"allOf": [
{
"properties": {
"address_country": {
"$ref": "#/$defs/d1"
},
"address_locality": {
"$ref": "#/$defs/d2"
},
"address_region": {
"$ref": "#/$defs/d3"
},
"extended_address": {
"$ref": "#/$defs/d4"
},
"first_name": {
"$ref": "#/$defs/d5"
},
"last_name": {
"$ref": "#/$defs/d6"
},
"phone_number": {
"$ref": "#/$defs/d7"
},
"postal_code": {
"$ref": "#/$defs/d8"
},
"street_address": {
"$ref": "#/$defs/d9"
}
},
"title": "Postal Address",
"type": "object"
},
{
"properties": {
"id": {
"description": "Platform-assigned ID for this address.",
"type": "string"
},
"type": {
"const": "shipping_address",
"type": "string"
}
},
"required": [],
"type": "object"
}
],
"title": "Shipping Destination",
"type": "object"
},
"type": "array"
}
}
}
},
{
"if": {
"properties": {
"type": {
"const": "pickup"
}
},
"required": [
"type"
]
},
"then": {
"properties": {}
}
}
],
"dependentRequired": {
"destinations": [
"type"
]
},
"properties": {
"groups": {
"description": "Merchant groups; select returned options.",
"items": {
"additionalProperties": true,
"properties": {
"selected_option_id": {
"description": "Option ID returned for this group.",
"type": [
"string",
"null"
]
}
},
"required": [],
"title": "Fulfillment Group",
"type": "object"
},
"type": "array"
},
"selected_destination_id": {
"description": "Merchant-scoped; need not be returned.",
"type": [
"string",
"null"
]
},
"type": {
"description": "Shipping, pickup, or another supported type.",
"type": "string"
}
},
"required": [
"type"
],
"title": "Fulfillment Method",
"type": "object"
},
"type": "array"
}
},
"title": "Fulfillment",
"type": "object"
}
]
}
},
"type": "object"
}
],
"title": "Checkout with Fulfillment"
},
{
"not": {
"required": [
"attribution"
]
}
}
],
"type": "object"
},
"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": [
"checkout",
"shop"
],
"type": "object"
}
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