---
updatedAt: 2026-09-29T16:09:14.000Z
agentTools:
  projectIndex: https://docs.falco-app.be/llms.txt
---

# Update an article

Required scopes: `articles:write`

Omitted fields = unchanged. Send `null` to erase value, if allowed to.


# OpenAPI definition

```json
{
  "openapi": "3.1.0",
  "info": {
    "title": "Falco Billing",
    "version": "1.0.0",
    "description": "`X-Falco-App-Secret` + `X-Falco-Api-Key`. Politique d'erreurs \"safe by default\" (RFC 9457).\n"
  },
  "servers": [
    {
      "url": "https://api.falco-app.be/v1",
      "description": "Production"
    },
    {
      "url": "https://api.sandbox.falco-app.be/v1",
      "description": "Sandbox"
    }
  ],
  "security": [
    {
      "ApiKeyAuth": []
    }
  ],
  "components": {
    "securitySchemes": {
      "ApiKeyAuth": {
        "type": "apiKey",
        "in": "header",
        "name": "X-Falco-App-Secret",
        "description": "`X-Falco-App-Secret`: Falco Application Secret associated to your application. Use together with the `X-Falco-Api-Key` header."
      }
    },
    "schemas": {
      "Problem": {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "format": "uri"
          },
          "title": {
            "type": "string"
          },
          "status": {
            "type": "integer"
          },
          "code": {
            "type": "string"
          },
          "detail": {
            "type": "string"
          },
          "instance": {
            "type": "string"
          },
          "trace_id": {
            "type": "string"
          }
        }
      },
      "Article": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string",
            "readOnly": true
          },
          "article_descriptions": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "language": {
                  "type": "string",
                  "minLength": 2,
                  "maxLength": 2
                },
                "reference": {
                  "type": "string"
                },
                "description": {
                  "type": "string"
                }
              }
            }
          },
          "unit_price": {
            "type": "string"
          },
          "unit_price_incl_taxes": {
            "type": "string"
          },
          "unit_of_measure": {
            "type": "string",
            "description": "Must be part of UBL list (https://docs.peppol.eu/poacc/billing/3.0/codelist/UNECERec20/)"
          },
          "category": {
            "type": "string"
          },
          "type": {
            "type": "string"
          },
          "cost_code": {
            "type": "string"
          },
          "account_number": {
            "type": "string",
            "description": "Account used in accounting software for this article (Horus only)."
          }
        }
      },
      "ArticleUpdateRequest": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "article_descriptions": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "language": {
                  "type": "string"
                },
                "reference": {
                  "type": "string"
                },
                "description": {
                  "type": "string"
                }
              }
            }
          },
          "unit_price": {
            "type": "string"
          },
          "unit_price_incl_taxes": {
            "type": "string"
          },
          "currency": {
            "type": "string"
          },
          "tax_rate": {
            "type": "string"
          },
          "unit_of_measure": {
            "type": "string"
          },
          "category": {
            "type": "string"
          },
          "type": {
            "type": "string"
          },
          "cost_code": {
            "type": "string"
          },
          "account_number": {
            "type": "string",
            "description": "Account used in accounting software for this article (Horus only)."
          },
          "can_use_reduced_vat_rate": {
            "type": "boolean",
            "default": false
          }
        }
      }
    }
  },
  "paths": {
    "/articles/{id}": {
      "patch": {
        "summary": "Update an article",
        "tags": [
          "Articles"
        ],
        "description": "Required scopes: `articles:write`\n\nOmitted fields = unchanged. Send `null` to erase value, if allowed to.\n",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "X-Falco-Api-Key",
            "in": "header",
            "required": true,
            "description": "Falco Api Key (provided by the client - required in addition to X-Falco-App-Secret).",
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/ArticleUpdateRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Updated article",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Article"
                }
              }
            }
          },
          "default": {
            "description": "Error (RFC 9457)",
            "content": {
              "application/problem+json": {
                "schema": {
                  "$ref": "#/components/schemas/Problem"
                }
              }
            }
          }
        }
      }
    }
  }
}
```