# Create Linked Object

Create a linked object in the document.

> 🚧 
> 
> You can only link each document to each CRM once. This ensures the consistent functionality of the [two-way CRM sync](https://support.pandadoc.com/en/articles/9714877-hubspot-crm#h_3a3344e8-2a6e-4fd8-86be-0da8c121e4ac).
> 
> You can, however, link one document to several external systems.


# OpenAPI definition

```json
{
  "openapi": "3.0.3",
  "info": {
    "title": "PandaDoc Public API",
    "description": "PandaDoc API spans a broad range of functionality to help you build incredible documents automation experiences inside your product.\n\nPandaDoc API is organized around REST. Our API has predictable resource-oriented URLs and uses standard HTTP response codes, authentication, and verbs.\n\n## Getting started\n\nYou can start testing PandaDoc API with a sandbox key on our [Enterprise](https://www.pandadoc.com/pricing/) plan, either active or in trial.\n\nGenerate your [sandbox key](https://developers.pandadoc.com/reference/sandbox-key) on the Developer Dashboard with predefined [rate limits](https://developers.pandadoc.com/reference/limits). Or contact our solutions expert if you work with high-transaction volumes.\n\n## Guides\n\nIf you’re just getting started with PandaDoc, you may want to jump straight into one of our [getting started guides](https://developers.pandadoc.com/docs/getting-started) for the feature you’re most interested in, whether that’s:\n\n- [Create from template](https://developers.pandadoc.com/docs/create-send-document),\n- [Upload and send a local PDF](https://developers.pandadoc.com/docs/upload-and-send-a-local-pdf),\n- or [Listening for changes in document status](https://developers.pandadoc.com/docs/listen-document-status-changes).\n\nWe also recommend you to discover our dynamic content generation on a fly: [Create from a template with content placeholder](https://developers.pandadoc.com/docs/create-with-content-placeholders-from-template).\n",
    "termsOfService": "https://www.pandadoc.com/master-services-agreement/",
    "contact": {
      "name": "PandaDoc API Support",
      "url": "https://developers.pandadoc.com/",
      "email": "api-track@pandadoc.com"
    },
    "license": {
      "name": "MIT",
      "url": "https://github.com/PandaDoc/pandadoc-openapi-specification/blob/main/LICENSE"
    },
    "version": "7.18.2"
  },
  "servers": [
    {
      "url": "https://api.pandadoc.com",
      "description": "Public API"
    }
  ],
  "security": [
    {
      "apiKey": []
    },
    {
      "oauth2": []
    }
  ],
  "tags": [
    {
      "name": "Document Link to CRM",
      "description": "Operations for managing links between documents and CRM entities."
    }
  ],
  "paths": {
    "/public/v1/documents/{id}/linked-objects": {
      "post": {
        "tags": [
          "Document Link to CRM"
        ],
        "summary": "Create Linked Object",
        "operationId": "createLinkedObject",
        "description": "Create a linked object in the document.\n\n> 🚧 \n> \n> You can only link each document to each CRM once. This ensures the consistent functionality of the [two-way CRM sync](https://support.pandadoc.com/en/articles/9714877-hubspot-crm#h_3a3344e8-2a6e-4fd8-86be-0da8c121e4ac).\n> \n> You can, however, link one document to several external systems.\n",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "schema": {
              "type": "string"
            },
            "required": true,
            "description": "Specify document ID.",
            "example": "ZPeAfcpzr9aiVs5vqUf6jg"
          }
        ],
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/LinkedObjectCreateRequest"
              },
              "examples": {
                "Create Linked Object": {
                  "value": {
                    "provider": "pipedrive",
                    "entity_type": "deal",
                    "entity_id": "134"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/LinkedObjectCreateResponse"
                },
                "examples": {
                  "Create Linked Object": {
                    "value": {
                      "provider": "pipedrive",
                      "entity_type": "deal",
                      "entity_id": "134",
                      "id": "abb4d3fc-919b-491e-9e08-775036660c0b"
                    }
                  }
                }
              }
            }
          },
          "400": {
            "$ref": "#/components/responses/400RequestError"
          },
          "401": {
            "$ref": "#/components/responses/401"
          },
          "403": {
            "$ref": "#/components/responses/403"
          },
          "404": {
            "$ref": "#/components/responses/404"
          },
          "429": {
            "$ref": "#/components/responses/429"
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "apiKey": {
        "type": "apiKey",
        "name": "Authorization",
        "in": "header",
        "description": "The `Authorization` header must contain the API key. The value should be prefixed with `API-Key` followed by a space and the actual API key.\n",
        "x-default": "API-Key 3039ba033eb1410caa0a2227158d63c9d6502cd8"
      },
      "oauth2": {
        "type": "oauth2",
        "flows": {
          "authorizationCode": {
            "authorizationUrl": "https://app.pandadoc.com/oauth2/authorize",
            "tokenUrl": "https://api.pandadoc.com/oauth2/access_token",
            "refreshUrl": "https://api.pandadoc.com/oauth2/access_token",
            "scopes": {
              "read+write": "Use `read+write` to create, send, delete, and download documents, and `read` to view templates and document details."
            }
          }
        },
        "description": "Send the authenticating user to the PandaDoc OAuth2 request URL. We recommend a button or a link titled\n\"Connect to PandaDoc\" if you are connecting users from a custom application. Users will see the \"Authorize Application\" screen.\nWhen the user clicks \"Authorize\", PandaDoc redirects the user back to your site with an authorization code inside the URL.\n\nhttps://app.pandadoc.com/oauth2/authorize?client_id={client_id}&redirect_uri={redirect_uri}&scope=read+write&response_type=code\n\n`client_id` and `redirect_uri` values should match your application settings.\n"
      }
    },
    "schemas": {
      "LinkedObjectChild": {
        "type": "object",
        "description": "Child entity reference in a hierarchical chain structure that provides essential metadata and direct access links for lazy-loading the complete object by ID.",
        "properties": {
          "id": {
            "type": "string",
            "description": "Linked object identifier (link_id).",
            "example": "abb4d3fc-919b-491e-9e08-775036660c0b"
          },
          "entity_type": {
            "type": "string",
            "description": "Entity type.\n\nSee the available entity types:\nhttps://developers.pandadoc.com/reference/link-service#examples-of-the-most-popular-crms\n",
            "example": "deal"
          },
          "entity_id": {
            "type": "string",
            "description": "Entity unique identifier. The system validates if the entity exists.",
            "example": "9372"
          }
        }
      },
      "LinkedObjectCreateResponse": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string",
            "description": "Linked object identifier (link_id).",
            "example": "abb4d3fc-919b-491e-9e08-775036660c0b"
          },
          "provider": {
            "type": "string",
            "description": "CRM name (lowercase).\n\nSee the list of available providers:\nhttps://developers.pandadoc.com/reference/link-service#examples-of-the-most-popular-crms\n",
            "example": "pipedrive"
          },
          "entity_type": {
            "type": "string",
            "description": "Entity type.\n\nSee the available entity types:\nhttps://developers.pandadoc.com/reference/link-service#examples-of-the-most-popular-crms\n",
            "example": "deal"
          },
          "entity_id": {
            "type": "string",
            "description": "Entity unique identifier. The system validates if the entity exists.",
            "example": "9372"
          },
          "children": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/LinkedObjectChild"
            }
          }
        }
      },
      "LinkedObjectCreateRequest": {
        "type": "object",
        "properties": {
          "provider": {
            "type": "string",
            "description": "CRM name (lowercase).\n\nSee the list of available providers:\nhttps://developers.pandadoc.com/reference/link-service#examples-of-the-most-popular-crms\n",
            "example": "pipedrive"
          },
          "entity_type": {
            "type": "string",
            "description": "Entity type.\n\nSee the available entity types:\nhttps://developers.pandadoc.com/reference/link-service#examples-of-the-most-popular-crms\n",
            "example": "deal"
          },
          "entity_id": {
            "type": "string",
            "description": "Entity unique identifier. The system validates if the entity exists.",
            "example": "9372"
          }
        },
        "required": [
          "provider",
          "entity_type",
          "entity_id"
        ]
      }
    },
    "responses": {
      "401": {
        "description": "Authentication error",
        "content": {
          "application/json": {
            "schema": {
              "properties": {
                "type": {
                  "type": "string",
                  "example": "authentication_error"
                },
                "detail": {
                  "type": "string",
                  "example": "Authentication credentials were not provided."
                }
              }
            }
          }
        }
      },
      "403": {
        "description": "Permission error",
        "content": {
          "application/json": {
            "schema": {
              "properties": {
                "type": {
                  "type": "string",
                  "example": "permission_error"
                },
                "detail": {
                  "type": "string",
                  "example": "You do not have permission to perform this action."
                },
                "info_message": {
                  "type": "string",
                  "description": "Human-readable explanation of the permission error.",
                  "example": "You are not allowed to send documents outside of your organization"
                },
                "links": {
                  "type": "array",
                  "description": "Optional links related to the error (e.g. a status endpoint).",
                  "items": {
                    "type": "object",
                    "properties": {
                      "rel": {
                        "type": "string",
                        "example": "status"
                      },
                      "href": {
                        "type": "string",
                        "example": "https://api.pandadoc.com/public/v1/documents/RsXrKarV524iCpjci9CMGa"
                      },
                      "type": {
                        "type": "string",
                        "example": "POST"
                      }
                    }
                  }
                }
              }
            }
          }
        }
      },
      "404": {
        "description": "Not found",
        "content": {
          "application/json": {
            "schema": {
              "properties": {
                "type": {
                  "type": "string",
                  "example": "request_error"
                },
                "detail": {
                  "type": "string",
                  "example": "Not found"
                }
              }
            }
          }
        }
      },
      "429": {
        "description": "Too Many Requests",
        "content": {
          "application/json": {
            "schema": {
              "properties": {
                "type": {
                  "type": "string",
                  "example": "throttled"
                },
                "detail": {
                  "type": "string",
                  "example": "Request was throttled."
                }
              }
            }
          }
        }
      },
      "400RequestError": {
        "description": "Bad Request",
        "content": {
          "application/json": {
            "schema": {
              "properties": {
                "type": {
                  "type": "string",
                  "example": "request_error"
                },
                "detail": {
                  "type": "object",
                  "example": {
                    "count": [
                      "A valid integer is required."
                    ],
                    "order_by": [
                      "value is not a valid choice."
                    ]
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}
```