---
updatedAt: 2026-05-05T20:25:41.000Z
agentTools:
  siteIndex: https://docs.recurly.com/llms.txt
  projectIndex: https://docs.recurly.com/recurly-commerce/llms.txt
---

# Create One Time Add On

Add an one-time add-on to an upcoming order

# OpenAPI definition

```json
{
  "openapi": "3.0.0",
  "paths": {
    "/api/v1/oneTimeAddOns": {
      "post": {
        "operationId": "createOneTimeAddOn",
        "summary": "Create One Time Add On",
        "description": "Add an one-time add-on to an upcoming order",
        "parameters": [],
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/AddOnInputDto"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Successfully created one-time add-on",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/OneTimeAddOnDto"
                }
              }
            }
          }
        },
        "security": [
          {
            "bearer": []
          }
        ],
        "tags": [
          "OneTimeAddOns API"
        ]
      }
    }
  },
  "info": {
    "title": "Recurly Commerce API Documentation",
    "description": "Recurly Commerce API Documentation",
    "version": "1.3",
    "contact": {}
  },
  "servers": [
    {
      "url": "https://subs.api.recurlycommerce.com"
    }
  ],
  "components": {
    "securitySchemes": {
      "bearer": {
        "scheme": "bearer",
        "bearerFormat": "JWT",
        "type": "http"
      }
    },
    "schemas": {
      "OneTimeAddOnDto": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "variantId": {
            "type": "string"
          },
          "quantity": {
            "type": "number"
          },
          "modifierType": {
            "type": "string",
            "enum": [
              "PERCENTAGE",
              "AMOUNT",
              "FIXED_AMOUNT"
            ]
          },
          "discount": {
            "type": "number"
          },
          "variantPriceOverride": {
            "type": "number"
          },
          "discountedVariantPrice": {
            "type": "number",
            "description": "Calculated price after applying discount"
          }
        },
        "required": [
          "id",
          "variantId",
          "quantity"
        ]
      },
      "AddOnInputDto": {
        "type": "object",
        "properties": {
          "variantId": {
            "type": "string"
          },
          "quantity": {
            "type": "number"
          },
          "subscriptionId": {
            "type": "string"
          },
          "upcomingOrderDate": {
            "format": "date-time",
            "type": "string",
            "description": "The date of upcoming order",
            "default": "2023-01-01T00:00:00.000Z"
          },
          "modifierType": {
            "type": "string",
            "enum": [
              "PERCENTAGE",
              "AMOUNT",
              "FIXED_AMOUNT"
            ],
            "description": "Type of discount: PERCENTAGE or FIXED_AMOUNT"
          },
          "discount": {
            "type": "number",
            "description": "Discount amount. If modifierType is PERCENTAGE, this is a percentage (0-100). If FIXED_AMOUNT, this is the amount in currency."
          },
          "variantPriceOverride": {
            "type": "number",
            "description": "Override price for the variant. If specified, this will be used instead of modifierType and discount."
          }
        },
        "required": [
          "variantId",
          "quantity",
          "subscriptionId",
          "upcomingOrderDate"
        ]
      }
    }
  },
  "x-readme": {
    "explorer-enabled": false
  }
}
```

# Sibling pages

* [Update One Time Add On](https://docs.recurly.com/recurly-commerce/reference/updateonetimeaddon.md)
* [Delete One Time Add On](https://docs.recurly.com/recurly-commerce/reference/deleteonetimeaddon.md)