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Klaviyo | Send SMS and MMS within Klaviyo flows using webhooks

  • Updated
✔ Sinch MessageMedia
× DirectSMS
× MessageNet
× MobiPost
× SMSBroadcast
× SMSCentral
× Streetdata
× WholesaleSMS

You can send SMS or MMS directly with Sinch MessageMedia 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 MessageMedia 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.

    Create new Klaviyo flow.

  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.

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

  6. Click the Destination URL field and enter https://api.messagemedia.com/v1/messages.

    Fill in webhook details - name and destination URL.
  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 (copied from Sinch platform)

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

    Add headers.
  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 MessageMedia 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
  1. Click Save to complete set up. Your SMS (or MMS) is now configured.

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