Please follow the below steps:
STEP 1 : Visit the Shopify Admin Console, click on Apps and then click Apps button and then click the Vajro Mobile App Platform
STEP 2 : In Vajro console click INTEGRATIONS button.
STEP 3 : In Integrations page search for the WhatsApp and click on it.
STEP 4 : After opening the WhatsApp integration, enter your WhatsApp number and click on save changes and enable button.
STEP 5 : Now you can see the integration enabled successfully pop up and test your mobile app.