Generate your Whatsapp APIs on Sendapp Colud
Log in or register on https://app.sendapp.cloud and create an instance with your multi-session WhatsApp Business or Personal account.
After creating your instance, you can copy your token and your instance ID to paste it into the Shopify webhook configurator. https://shopify.sendapp.live/generate.php

Message Configuration 

Go to webhook configuration https://shopify.sendapp.live/generate.php To customize the notification messages you want to send to your customers. If you want to edit the messages for an existing account, after entering your token and instance, press the EDIT button. Your notifications will appear for editing. In the "Whatsapp Phone Number for Admin notification" field, enter a WhatsApp phone number including the country code, without any s, hyphens, or parentheses. This number will be used to receive notifications as an admin. Once you've finished customizing, click the "GENERATE URL FOR SHOPIFY" button. The custom URL you can insert into your Shopify admin will appear.

Setting Up Shopify Notifications

Log in to your Shopfy admin, go to Settings / Notifications at the end of this page you will find the section Webhook
Click the “Create Webhook” button. Select “Order Update” and “JSON” format from the events.
Paste the Sendapp URL into the URL field, select Webhook API version 2022-4 (Latest) from the menu.
To confirm the sending of notifications, you must click the Save button and you are immediately ready to send WhatsApp notifications from your Store.