> ## Documentation Index > Fetch the complete documentation index at: https://docs.ycloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Check a Meta contact book entry > Checks whether Meta has a phone number entry for this standard BSUID in this business phone number contact book, without returning the phone number. Uses the same account API key, available WABA ownership and bound phone checks as DELETE. Parent BSUIDs are unsupported; Developer App API keys return 403. Successful responses contain required boolean present; provider failures are not converted to false. ## OpenAPI ````yaml /openapi/endpoints/ycloud-api-v2.yaml get /whatsapp/phoneNumbers/{wabaId}/{phoneNumber}/contactBook/{bsuid} openapi: 3.0.0 info: description: >- The [YCloud](https://ycloud.com) API is organized around [REST](https://en.wikipedia.org/wiki/Representational_state_transfer). Our API is designed to have predictable, resource-oriented URLs, return [JSON](https://www.json.org) responses, and use standard HTTP response codes and verbs. version: v2 title: YCloud API termsOfService: https://ycloud.com/terms-service contact: email: service@ycloud.com servers: - url: https://api.ycloud.com/v2 description: Base URL security: - api_key: [] tags: - name: Balance - name: Contacts - name: Custom Events - name: Emails - name: SMS - name: Unsubscribers - name: Verify - name: Voices - name: Webhook Endpoints - name: WhatsApp Business Accounts - name: WhatsApp Inbound Messages - name: WhatsApp Media - name: Messenger Messages - name: WhatsApp Messages - name: WhatsApp Blocked Users - name: WhatsApp Groups - name: WhatsApp Calling - name: WhatsApp Phone Numbers - name: WhatsApp Templates - name: WhatsApp Flows - name: Meta Business Agent externalDocs: description: Homepage url: https://ycloud.com paths: /whatsapp/phoneNumbers/{wabaId}/{phoneNumber}/contactBook/{bsuid}: get: tags: - WhatsApp Phone Numbers summary: Check a Meta contact book entry description: >- Checks whether Meta has a phone number entry for this standard BSUID in this business phone number contact book, without returning the phone number. Uses the same account API key, available WABA ownership and bound phone checks as DELETE. Parent BSUIDs are unsupported; Developer App API keys return 403. Successful responses contain required boolean present; provider failures are not converted to false. operationId: whatsapp_phone_number-get-contact-book-entry parameters: - name: wabaId in: path description: WhatsApp Business Account ID. required: true schema: type: string example: whatsapp-business-account-id - name: phoneNumber in: path description: >- Phone number in [E.164](https://en.wikipedia.org/wiki/E.164) format, bound to the specified WABA in YCloud. When constructing the path manually, URL-encode the leading `+` as `%2B`. required: true schema: type: string example: '+16315551111' - name: bsuid in: path description: >- Standard WhatsApp Business-scoped user ID (BSUID) from the same Meta business portfolio as the phone number. Parent BSUIDs containing `.ENT.` are not supported. required: true schema: type: string pattern: ^[A-Z]{2}\.[0-9]+$ example: US.11815799212886844830 responses: '200': description: The presence check completed successfully. content: application/json: schema: $ref: '#/components/schemas/WhatsappContactBookEntryResult' '400': description: >- One or more path parameters are invalid, or Meta returned HTTP 400 for the presence check. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: >- The API key is not permitted to call this endpoint, the specified WABA is unavailable to the authenticated YCloud account, the phone number is unavailable or not bound to that WABA in YCloud, or Meta returned HTTP 403. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: >- Meta returned HTTP 404 for the phone number's upstream contact book resource. This status is not used when no matching contact book entry exists; that case returns HTTP 200 with `present=false`. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: WhatsappContactBookEntryResult: type: object required: - present properties: present: type: boolean description: >- Whether a phone number entry exists for this BSUID in the phone number contact book. example: true ErrorResponse: type: object required: - error properties: error: $ref: '#/components/schemas/Error' description: >- Contains the error code and human-readable message for the API error. Error: type: object required: - status - code properties: status: type: integer format: int32 pattern: '[45]\d{2}' description: >- HTTP status code, [RFC 7231, Section 6](https://datatracker.ietf.org/doc/html/rfc7231#section-6). It conveys the HTTP status code used for the convenience of the consumer. example: 404 code: type: string description: >- One of a server-defined error codes. Some `4xx` errors that could be handled programmatically include an error code that briefly explains the error reported. example: NOT_FOUND message: type: string description: >- A human-readable representation of the error. It is intended as an aid to developers and is not suitable for exposure to end users. example: The requested resource does not exist. target: type: string description: The target of the error. example: '' docUrl: type: string description: A URL to more information about the error. example: '' requestId: type: string description: >- Each API request has an associated request ID. It conveys the response header `YCloud-Request-ID` used for the convenience of the consumer. example: req_1KjtKI80IKoaJNa6n6p whatsappApiError: $ref: '#/components/schemas/WhatsappApiError' description: >- The original error object returned by WhatsApp. See [Handling Errors](https://developers.facebook.com/docs/graph-api/guides/error-handling), [Cloud API Error Codes](https://developers.facebook.com/docs/whatsapp/cloud-api/support/error-codes). Note: This field is returned if we tried to request the WhatsApp Business API and got an error response. metaBusinessAgentApiError: $ref: '#/components/schemas/MetaBusinessAgentApiError' description: >- Sanitized upstream details returned when a Meta Business Agent request fails. messengerApiError: $ref: '#/components/schemas/MessengerApiError' description: >- Numeric Meta diagnostics for a confirmed Messenger submission refusal. Omitted when unavailable. WhatsappApiError: type: object description: >- The original error object returned by WhatsApp. See [Handling Errors](https://developers.facebook.com/docs/graph-api/guides/error-handling), [Cloud API Error Codes](https://developers.facebook.com/docs/whatsapp/cloud-api/support/error-codes). required: - message - code properties: message: type: string description: A human-readable description of the error. example: HSM Template creation failed code: type: string description: An error code. example: 200002 type: type: string description: Error type. example: OAuthException is_transient: type: boolean description: Whether the error is transient. example: false error_subcode: type: string description: Additional code about the error. example: 2388109 error_user_msg: type: string description: >- The message to display to the user. The language of the message is based on the locale of the API request. example: This message template cannot be created. error_user_title: type: string description: >- The title of the dialog, if shown. The language of the message is based on the locale of the API request. example: Message Cannot Be Submitted fbtrace_id: type: string description: >- Internal support identifier. When reporting a bug related to a Graph API call, include the fbtrace_id to help us find log data for debugging. example: AVGjJ7ia2zJkrHG error_data: description: >- Additional data about the error. A string or map. - For template APIs, this field is a string describing the reason for the error. - For message APIs, this field is a map with property `details` describing the reason for the error. oneOf: - type: string - type: object additionalProperties: true MetaBusinessAgentApiError: type: object description: Sanitized details from a failed Meta Business Agent upstream request. properties: title: type: string detail: type: string type: type: string status: type: integer format: int32 requestId: type: string MessengerApiError: type: object description: >- Numeric provider diagnostics only. Does not contain raw Meta error text or access credentials. required: - code properties: code: type: string description: Meta error code, encoded as a string. example: '100' subcode: type: string description: >- Meta error subcode, encoded as a string. Omitted if Meta did not provide it. example: '2018276' securitySchemes: api_key: type: apiKey name: X-API-Key in: header ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.