> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Send a prepared message

> Send prepared messages based on a given send datetime.

## OpenAPI

````json GET /preparedmessage/send
{
  "openapi": "3.0.4",
  "info": {
    "title": "Engage public API",
    "version": "1"
  },
  "servers": [
    {
      "url": "https://your-engage-domain.com/api/rest"
    }
  ],
  "tags": [
    {
      "name": "Address Attributes"
    },
    {
      "name": "Async"
    },
    {
      "name": "Audit Log"
    },
    {
      "name": "Automation"
    },
    {
      "name": "Blacklist"
    },
    {
      "name": "CMS"
    },
    {
      "name": "Contact"
    },
    {
      "name": "Content"
    },
    {
      "name": "Coupon"
    },
    {
      "name": "Draft Message"
    },
    {
      "name": "Ecommerce"
    },
    {
      "name": "Group"
    },
    {
      "name": "Group Attributes"
    },
    {
      "name": "Landing Page"
    },
    {
      "name": "Member Attributes"
    },
    {
      "name": "Membership"
    },
    {
      "name": "Message"
    },
    {
      "name": "Meta"
    },
    {
      "name": "Mobile Push"
    },
    {
      "name": "Prepared Message"
    },
    {
      "name": "Process"
    },
    {
      "name": "Profile Attributes"
    },
    {
      "name": "Related Data"
    },
    {
      "name": "Segmentation"
    },
    {
      "name": "System"
    },
    {
      "name": "System User"
    },
    {
      "name": "Usage Statistics"
    },
    {
      "name": "User"
    },
    {
      "name": "Whiteboard"
    }
  ],
  "paths": {
    "/preparedmessage/send": {
      "get": {
        "tags": [
          "Prepared Message"
        ],
        "summary": "Send a prepared message",
        "description": "Send prepared messages based on a given send datetime.",
        "operationId": "send",
        "parameters": [
          {
            "name": "preparedMessageId",
            "in": "query",
            "description": "The id of the prepared message you want to send.",
            "required": true,
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          },
          {
            "name": "sendDateTime",
            "in": "query",
            "description": "Sendout date-time. ISO_8601 format, in URL encoded form",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "processingDateTime",
            "in": "query",
            "description": "The preprocessing date-time (optional). ISO_8601 format, in URL encoded form",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "selectionId",
            "in": "query",
            "description": "A selection id to associate with the sendout (optional).",
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          },
          {
            "name": "bestSendoutTime",
            "in": "query",
            "description": "True/False.",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "bestSendoutTimeDefault",
            "in": "query",
            "description": "17:00.",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "bestSendoutTimeTimezone",
            "in": "query",
            "description": "Europe/Berlin.",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "",
            "content": {
              "application/octet-stream": {
                "schema": {
                  "$ref": "#/components/schemas/PreparedMessage"
                }
              }
            }
          },
          "400": {
            "description": "",
            "content": {
              "application/octet-stream": {}
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "PreparedMessage": {
        "type": "object",
        "properties": {
          "contactId": {
            "type": "integer",
            "format": "int64"
          },
          "messageId": {
            "type": "integer",
            "format": "int64"
          },
          "name": {
            "type": "string"
          },
          "groupId": {
            "type": "integer",
            "format": "int64"
          },
          "groupName": {
            "type": "string"
          },
          "selectionId": {
            "type": "integer",
            "format": "int64"
          },
          "selectionName": {
            "type": "string"
          },
          "channelId": {
            "type": "integer",
            "format": "int64"
          },
          "channelName": {
            "type": "string"
          },
          "externalId": {
            "type": "string"
          },
          "messageCategoryId": {
            "type": "integer",
            "format": "int64"
          },
          "messageCategoryName": {
            "type": "string"
          },
          "message": {
            "$ref": "#/components/schemas/MessageBase"
          },
          "trackingOverride": {
            "type": "integer",
            "format": "int64"
          }
        }
      },
      "MessageBase": {
        "type": "object",
        "properties": {
          "subject": {
            "type": "string"
          },
          "emailBodyText": {
            "type": "string"
          },
          "emailBodyHtml": {
            "type": "string"
          },
          "smsText": {
            "type": "string"
          },
          "faxText": {
            "type": "string"
          },
          "emailHeaders": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/Attribute"
            }
          },
          "attachments": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/Attachment"
            }
          },
          "attachmentReferences": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/AttachmentReference"
            }
          },
          "encoding": {
            "type": "string"
          },
          "encodingSMS": {
            "type": "string"
          },
          "imageHandlingMode": {
            "type": "string"
          }
        }
      },
      "Attribute": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "value": {
            "type": "string"
          }
        }
      },
      "Attachment": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "contentType": {
            "type": "string"
          },
          "content": {
            "type": "string"
          }
        }
      },
      "AttachmentReference": {
        "type": "object",
        "properties": {
          "contentId": {
            "type": "string"
          },
          "reference": {
            "type": "string"
          }
        }
      }
    }
  }
}
````