# smb_message_echoes webhook reference | Developer Documentation

<div id="bkmrk-smb_message_echoes-w">## smb\_message\_echoes webhook reference

<div><span>Updated: Oct 22, 2025</span></div><div>This reference describes trigger events and payload contents for the WhatsApp Business Account **smb\_message\_echoes** webhook.</div><div>The **smb\_message\_echoes** webhook notifies you of messages sent via the WhatsApp Business app or a [companion (“linked”) device](/books/meta-whatsapp/page/onboarding-whatsapp-business-app-users-aka-coexistence-developer-documentation) by a business customer who has been [onboarded to Cloud API](/books/meta-whatsapp/page/onboarding-whatsapp-business-app-users-aka-coexistence-developer-documentation) via a solution provider.</div><div id="bkmrk-triggers"><div id="bkmrk-triggers-1"><div>### Triggers

</div></div></div><span>A business customer with a WhatsApp Business app phone number, who has been [onboarded by a solution provider](/books/meta-whatsapp/page/onboarding-whatsapp-business-app-users-aka-coexistence-developer-documentation), sends a message using the WhatsApp Business app or a [companion device](/books/meta-whatsapp/page/onboarding-whatsapp-business-app-users-aka-coexistence-developer-documentation) to a WhatsApp user or another business.</span><div id="bkmrk-parameters"><div id="bkmrk-parameters-1"><div>### Parameters

</div></div></div><div><table><thead><tr><th><span>Placeholder </span></th><th><span>Description </span></th><th><span>Example value </span></th></tr></thead><tbody><tr><td><div><div>`<BUSINESS_DISPLAY_PHONE_NUMBER>`</div><div>*String*</div></div></td><td><div><div>Business display phone number.</div></div></td><td><div><div>`15550783881`</div></div></td></tr><tr><td><div><div>`<BUSINESS_PHONE_NUMBER_ID>`</div><div>*String*</div></div></td><td><div><div>Business phone number ID.</div></div></td><td><div><div>`106540352242922`</div></div></td></tr><tr><td><div><div>`<MESSAGE_CONTENTS>`</div><div>*Object*</div></div></td><td><div><div>An object describing the message’s contents.</div><div>This value will vary based on the message `type`, as well as the contents of the message.</div><div>For example, if a business sends an `image` message without a caption, the object would not include the `caption` property.</div><div>See [Sending messages](/books/meta-whatsapp/page/sending-messages-developer-documentation) for examples of payloads for each message type.</div></div></td><td></td></tr><tr><td><div><div>`<MESSAGE_TYPE>`</div><div>*String*</div></div></td><td><div><div>[Message type](/books/meta-whatsapp/page/messages-webhook-reference-developer-documentation). Note that this placeholder appears twice in the syntax above, as it serves as a placeholder for the `type` property’s value and its matching property name.</div></div></td><td><div><div>`text`</div></div></td></tr><tr><td><div><div>`<WEBHOOK_TRIGGER_TIMESTAMP>`</div><div>*Integer*</div></div></td><td><div><div>Unix timestamp indicating when the webhook was triggered.</div></div></td><td><div><div>`1739321024`</div></div></td></tr><tr><td><div><div>`<WHATSAPP_BUSINESS_ACCOUNT_ID>`</div><div>*String*</div></div></td><td><div><div>The business customer’s WhatsApp Business Account ID.</div></div></td><td><div><div>`102290129340398`</div></div></td></tr><tr><td><div><div>`<WHATSAPP_MESSAGE_ID>`</div><div>*String*</div></div></td><td><div><div>WhatsApp message ID.</div></div></td><td><div><div>`wamid.HBgLMTY1MDM4Nzk0MzkVAgASGBQzQUFERjg0NDEzNDdFODU3MUMxMAA=`</div></div></td></tr><tr><td><div><div>`<WHATSAPP_USER_PHONE_NUMBER>`</div><div>*String*</div></div></td><td><div><div>WhatsApp user phone number. This is the same value returned by the API as the `input` value when sending a message to a WhatsApp user. Note that a WhatsApp user’s phone number and ID may not always match.</div></div></td><td><div><div>`+16505551234`</div></div></td></tr></tbody></table>

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