update_checkout
Update an existing checkout session. Pass only the items you want to add or change — they are MERGED with existing items, not replaced. To remove an item, pass it with quantity=0. To update buyer info or payment without changing items, omit line_items entirely. Always use this instead of creating a new session.
17,506verified stores declare the update_checkout tool
95.1%of the verified stores we check
By store platform
Shopify 63%Wix 36%Boutir 1%
By release
agentdiet.dev
Shopware · 2026-08-25
alpha-stream.agentdiet.dev
Shopware · 2026-08-25
arxiv-digest.agentdiet.dev
Shopware · 2026-08-25
company-enrich.agentdiet.dev
Shopware · 2026-08-25
cve-intel.agentdiet.dev
Shopware · 2026-08-25
defi-yield.agentdiet.dev
Shopware · 2026-08-25
domain-osint.agentdiet.dev
Shopware · 2026-08-25
email-verify.agentdiet.dev
Shopware · 2026-08-25
github-audit.agentdiet.dev
Shopware · 2026-08-25
Each store has its own status page. To find more, search the directory.
Input schema
inputSchema
{
"type": "object",
"required": [
"checkout_id"
],
"properties": {
"buyer": {
"type": "object",
"required": [],
"properties": {
"email": {
"type": "string",
"description": "Customer email address"
},
"full_name": {
"type": "string",
"description": "Customer full name"
},
"phone_number": {
"type": "string",
"description": "Customer phone number"
}
},
"description": "Optional buyer information update"
},
"payment": {
"type": "object",
"required": [],
"properties": {
"instruments": {
"type": "array",
"items": {
"type": "object"
},
"description": "Array of payment instruments"
},
"selected_instrument_id": {
"type": "string",
"description": "ID of selected payment instrument"
}
},
"description": "Optional payment update"
},
"discounts": {
"type": "array",
"items": {
"type": "string"
},
"description": "Coupon or discount codes to apply to this session. Each element is a string code (e.g. \"DISCOUNT2026\"). Pass an empty array to remove all applied codes."
},
"line_items": {
"type": "array",
"items": {
"type": "object",
"required": [
"item",
"quantity"
],
"properties": {
"id": {
"type": "string",
"description": "Line item ID (optional for new items)"
},
"item": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string",
"description": "Product ID or variation ID"
}
},
"description": "Item reference with product or variation ID"
},
"quantity": {
"type": "integer",
"minimum": 0,
"description": "Quantity"
},
"parent_id": {
"type": "string",
"description": "Parent line item ID for variations"
}
}
},
"description": "Complete replacement list of all line items for the session. Include ALL items you want in the cart (both existing and new) \u2014 this replaces the current line_items entirely, not appends to them."
},
"checkout_id": {
"type": "string",
"description": "Checkout session ID to update"
},
"fulfillment": {
"type": "object",
"required": [],
"properties": {
"methods": {
"type": "array",
"items": {
"type": "object",
"required": [],
"properties": {
"type": {
"enum": [
"shipping",
"pickup",
"digital"
],
"type": "string",
"description": "Fulfillment method type"
},
"groups": {
"type": "array",
"items": {
"type": "object"
},
"description": "Fulfillment groups for this method"
},
"destinations": {
"type": "array",
"items": {
"type": "object"
},
"description": "Available destinations for this method"
},
"line_item_ids": {
"type": "array",
"items": {
"type": "string"
},
"description": "Line items for this fulfillment method"
},
"selected_destination_id": {
"type": "string",
"description": "Selected destination ID"
}
}
},
"description": "Array of fulfillment methods (shipping, pickup, digital)"
}
},
"description": "Optional fulfillment update"
}
}
}