mcp-gateway

apply_discount

Idempotent

Apply a discount or promo code to the cart.

SKYFIRE TOKEN (optional): Pass a kya or kya-pay token in the skyfire-pay-id header to boost trust score. No token required — request proceeds normally if omitted. Checkout guide: https://trusteed.xyz/.well-known/agent-checkout-guide.json. CREDENTIAL: this store needs one. Call the create_sandbox_key tool first (it is in this tool list and needs no credential), then pass the key you get back as the agent_key argument — or as an Authorization: Bearer header if your client can set headers. Do not ask a person to log in: there is no human login for this store.

Input Schema

TableJSON Schema

Name	Required	Description
`source`	No	Set to 'ucp_identity' to apply a loyalty discount derived from a UCP identity token instead of a promo code.
`cart_id`	Yes	Cart session ID
`agent_key`	No	Sandbox credential from `create_sandbox_key`. Use this when your client cannot set an `Authorization: Bearer` header.
`discount_code`	No	Discount or promo code to apply (required unless source is ucp_identity)
`identity_token`	No	UCP identity bearer token (required when source is ucp_identity).
`idempotency_key`	No	Idempotency key for this call (UUID-v4 or bounded ASCII token, 1-128 chars). Equivalent to the `Idempotency-Key` header — send it here if your client cannot set headers.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`cart_id`	Yes
`currency`	Yes
`discount_code`	Yes
`discount_cents`	Yes
`new_total_cents`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 10, 2026

changedInput schema / additionalProperties
```
Previous value: -trueNew value: +false
```

addedInput schema / properties / idempotency_key

Added value: +{
+  "description": "Idempotency key for this call (UUID-v4 or bounded ASCII token, 1-128 chars). Equivalent to the `Idempotency-Key` header — send it here if your client cannot set headers.",
+  "type": "string"
+}

Changed1 schema field changedSep 22, 2026

removedInput schema / properties / payment_mandate

Removed value: -{
-  "anyOf": [
-    {
-      "additionalProperties": {},
-      "type": "object"
-    },
-    {
-      "type": "string"
-    }
-  ],
-  "description": "Payment mandate with `mandate_id`, `max_amount_cents` (integer, minor units), `currency` (3 letters, must match the cart's), `exp` (expiry as an INTEGER of Unix seconds — not an ISO 8601 date string), `sub` (your agent id) and `aud` (the store slug this mandate is for, e.g. the slug in the URL you are calling — not a domain). Use this when your client cannot set an `X-Payment-Mandate` header."
-}

Changed1 schema field changedSep 21, 2026

changedInput schema / properties / payment_mandate / description

Previous value: -"Payment mandate with `mandate_id`, `max_amount_cents`, `currency`, `exp`, `sub`, `aud`. Its `currency` must match the cart's. Use this when your client cannot set an `X-Payment-Mandate` header."New value: +"Payment mandate with `mandate_id`, `max_amount_cents` (integer, minor units), `currency` (3 letters, must match the cart's), `exp` (expiry as an INTEGER of Unix seconds — not an ISO 8601 date string), `sub` (your agent id) and `aud` (the store slug this mandate is for, e.g. the slug in the URL you are calling — not a domain). Use this when your client cannot set an `X-Payment-Mandate` header."

Changed2 schema fields changedSep 20, 2026

addedInput schema / properties / agent_key

Added value: +{
+  "description": "Sandbox credential from `create_sandbox_key`. Use this when your client cannot set an `Authorization: Bearer` header.",
+  "type": "string"
+}

addedInput schema / properties / payment_mandate

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "type": "object"
+    },
+    {
+      "type": "string"
+    }
+  ],
+  "description": "Payment mandate with `mandate_id`, `max_amount_cents`, `currency`, `exp`, `sub`, `aud`. Its `currency` must match the cart's. Use this when your client cannot set an `X-Payment-Mandate` header."
+}

Changed2 schema fields changedSep 17, 2026
- changedInput schema / additionalProperties
```
Previous value: -falseNew value: +true
```
- changedOutput schema / additionalProperties
```
Previous value: -falseNew value: +true
```

Changed1 schema field changedSep 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "cart_id": {
+      "type": "string"
+    },
+    "currency": {
+      "type": "string"
+    },
+    "discount_cents": {
+      "type": "number"
+    },
+    "discount_code": {
+      "type": "string"
+    },
+    "new_total_cents": {
+      "type": "number"
+    }
+  },
+  "required": [
+    "cart_id",
+    "discount_code",
+    "discount_cents",
+    "new_total_cents",
+    "currency"
+  ],
+  "type": "object"
+}

Changed4 schema fields changedAug 24, 2026

addedInput schema / $schema

Added value: +"http://json-schema.org/draft-07/schema#"

addedInput schema / additionalProperties
```
Added value: +false
```

addedInput schema / properties

Added value: +{
+  "cart_id": {
+    "description": "Cart session ID",
+    "type": "string"
+  },
+  "discount_code": {
+    "description": "Discount or promo code to apply (required unless source is ucp_identity)",
+    "maxLength": 50,
+    "minLength": 1,
+    "type": "string"
+  },
+  "identity_token": {
+    "description": "UCP identity bearer token (required when source is ucp_identity).",
+    "maxLength": 4096,
+    "minLength": 1,
+    "type": "string"
+  },
+  "source": {
+    "const": "ucp_identity",
+    "description": "Set to 'ucp_identity' to apply a loyalty discount derived from a UCP identity token instead of a promo code.",
+    "type": "string"
+  }
+}

addedInput schema / required
```
Added value: +[
+  "cart_id"
+]
```

Changed5 schema fields changedJul 10, 2026

removedInput schema / $schema

Removed value: -"http://json-schema.org/draft-07/schema#"

removedInput schema / additionalProperties
```
Removed value: -false
```

removedInput schema / properties

Removed value: -{
-  "cart_id": {
-    "description": "Cart session ID",
-    "type": "string"
-  },
-  "discount_code": {
-    "description": "Discount or promo code to apply",
-    "maxLength": 50,
-    "minLength": 1,
-    "type": "string"
-  }
-}

removedInput schema / required

Removed value: -[
-  "cart_id",
-  "discount_code"
-]

changedOutput schema / (root)

Previous value: -{
-  "$schema": "http://json-schema.org/draft-07/schema#",
-  "additionalProperties": false,
-  "properties": {
-    "cart_id": {
-      "type": "string"
-    },
-    "currency": {
-      "type": "string"
-    },
-    "discount_cents": {
-      "type": "number"
-    },
-    "discount_code": {
-      "type": "string"
-    },
-    "new_total_cents": {
-      "type": "number"
-    }
-  },
-  "required": [
-    "cart_id",
-    "discount_code",
-    "discount_cents",
-    "new_total_cents",
-    "currency"
-  ],
-  "type": "object"
-}New value: +null

First observedApr 28, 2026

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