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Requirements

While the following guide uses the Facebook/Meta API, Twilio can also be used to Post WhatsApp messages.

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Setup

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1. Import recipients phone numbers

WhatsApp supporting numbers should be uploaded as a data tag to a User. Here’s an example:

WhatsApp phone number data tag example

Please add numbers in the E.164 format, but without the + sign. The number +16463938787 should be added as 16463938787.

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2. Obtain Webhook code

Once you have created your Meta/Facebook Business account and have activated your WhatsApp Module, you’ll be given an API access token. You’ll be able to find this information under WhatsApp -> API Setup

WhatsApp API setup credentials screen

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3. Create a Webhook Template

  • Within OneSignal, click on: Data > Webhooks > New Webhook
  • Copy over the credentials. It should look like this:

WhatsApp webhook configuration template

{{user.tags.WhatsApp_number}} tag key is added as the “to” number as highlighted above.

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4. Create a Journey

You can now create your Journey and add your new WhatsApp Webhook.

WhatsApp webhook selection

When testing, please make sure of the following:
  • The subscription id in which you have added the WhatsApp number has an external id
  • The subscription id matches the Journey included segment(s)