> ## Documentation Index > Fetch the complete documentation index at: https://docs.asapp.com/llms.txt > Use this file to discover all available pages before exploring further. # List messages with an externalId > Get all messages from a conversation. ## OpenAPI ````yaml get /conversation/v1/conversation/messages openapi: 3.0.1 info: title: Conversations API description: Operations to manage ASAPP conversations contact: email: api-info@asapp.com license: name: ASAPP Software License url: https://api.asapp.com/LICENSE version: '0.1' servers: - url: https://api.sandbox.asapp.com security: - API-ID: [] API-Secret: [] tags: - name: Conversations description: Operations to send conversational inputs to ASAPP AI services paths: /conversation/v1/conversation/messages: get: tags: - Conversations summary: List messages with an externalId description: | Get all messages from a conversation. operationId: getMessagesByExternalId parameters: - name: externalId description: Your identifier for a conversation. in: query required: true schema: type: string example: externalId: id-111 responses: '200': description: Successfully fetched messages from a conversation content: application/json: schema: description: Response for GetMessages type: object properties: items: type: array items: description: A message sent by a participant of a conversation type: object properties: text: type: string minLength: 1 description: Text sent sender: description: A participant within a conversation type: object properties: role: description: > A participant role, usually the customer or an agent for human participants. System participant is also allowed but keep in mind that this role won't be considered a participant in a conversation, just a message sender. type: string enum: - agent - customer - system externalId: type: string nullable: true description: >- The unique identifier for the relevant participant role. required: - role messageId: type: string minLength: 1 description: The identifier of the message. createdTimestamp: type: string format: date-time description: >- The time when the message objectwas created in the ASAPP system. clientTimestamp: type: string format: date-time description: The timestamp of when the message was sent. required: - text - sender - messageId - createdTimestamp - clientTimestamp example: text: >- Hello, I would like to upgrade my internet plan to GOLD. sender: role: customer externalId: '123456' messageId: 01GMXE90AEV7H3J4DPBDKB1R79 createdTimestamp: '2021-11-23T12:13:16.853Z' clientTimestamp: '2021-11-23T12:13:14.555Z' '400': description: 400 - Bad request content: application/json: schema: description: Bad request response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 400-01 message: Bad request description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '401': description: 401 - Unauthorized content: application/json: schema: description: Unauthorized response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 401-01 message: Unauthorized description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '403': description: 403 - Forbidden content: application/json: schema: description: Forbidden response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 403-01 message: Forbidden Response description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '404': description: 404 - Not Found content: application/json: schema: description: Not Found response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 404-01 message: Not Found description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '409': description: 409 - Conflict content: application/json: schema: description: Conflict response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 409-01 message: Conflict description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '413': description: 413 - Request Entity Too Large content: application/json: schema: description: Request Entity Too Large response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 413-01 message: Request Entity Too Large description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '422': description: 422 - Unprocessable Entity content: application/json: schema: description: Unprocessable Entity response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 422-01 message: Unprocessable Entity description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '429': description: 429 - Too Many Requests content: application/json: schema: description: Too Many Requests response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 429-01 message: Too Many Requests description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message '503': description: 503 - Service Unavailable content: application/json: schema: description: Service Unavailable response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 503-01 message: Service Unavailable description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message default: description: 500 - Internal Server Error content: application/json: schema: description: Default error response type: object properties: error: example: requestId: 8e033668-9f1a-11ec-b909-0242ac120002 code: 500-01 message: Internal server error description: Error details type: object properties: requestId: type: string description: Unique ID of the failing request message: type: string description: Error message code: type: string description: Error code required: - requestId - message components: securitySchemes: API-ID: type: apiKey in: header name: asapp-api-id API-Secret: type: apiKey in: header name: asapp-api-secret ````