Klaviyo | Send SMS and MMS within Klaviyo flows using webhooks

You can send SMS or MMS directly with Sinch Engage within Klaviyo flows using webhooks.

Send SMS/MMS within Klaviyo flows using webhooks

1. Create a segment in Klaviyo with all your contacts and then sync your contacts to the Sinch Engage platform. This is necessary for the integration to pass back opt-outs to Klaviyo.
2. Navigate to Klaviyo flows. 

3. Click the hyperlinked flow name to edit an existing flow, or select Create Flow to start a new one from scratch.

   

4. When you're ready to add an SMS/MMS to your flow, use the Webhook node (not the SMS option) by dragging and dropping the Webhook into the flow at the point where you'd like the SMS to be triggered.

   

5. Name your Webhook e.g. BFCM SMS.

6. Click the Destination URL field and enter the appropriate URL into the Destination URL:

   • au.app.api.sinch.com/v1/messages
   • eu.app.api.sinch.com/v1/messages

   You can find your endpoint in your API & Webhook Settings (in your Sinch Engage account, click on Settings and then API Settings). 

   

   

   

7. Under Headers, add the following inputs:

   • Key: Content-Type

   • Value: application/json

8. Click the Add Header button to add the following inputs:

   • Key: Authorization

   • Value: Auth header in Base64 format

     You'll require your Sinch Basic authentication credentials, which can be generated from the following link.

     

     

9. To create your message, use the Sinch JSON Generator and copy the generated JSON into the Webhook body in Klaviyo. Please note: 
   • Within the 'content' section, it's important to include the following information.
     • Links to your products/promotion
     • Opt-out links: Generate an opt-out link from the Sinch Engage platform and include at the end of your message (you can do this by sending a message to yourself with an opt-out link in it - this same opt-out link can be used for all SMS actions in your flows)
   • Source_number: Add your verified alpha number sender ID (formerly alpha tag)
   • Format: Select SMS or MMS
     • When selecting MMS, you will need to provide a URL for publicly available media files - e.g. not sitting behind a login screen.
     • Important note: your account must be enabled to send MMS. Please check with your Account Manager if you're unsure. 
   • Metadata: Turn on the Klaviyo metadata toggle when setting up this type of automation

10. Click Save to complete set up. Your SMS (or MMS) is now configured.