To send WhatsApp messages to customers (broadcasts, cart recovery, order updates, etc.), you need a valid customer phone number that includes the country code (e.g., +84912345678)

This article guides you through configuring Shopify Checkout to:

• Require or allow customers to enter their phone number
• Display an opt-in checkbox for SMS/WhatsApp marketing
• Ensure phone numbers are saved in the correct format so WASend can use them

Step 1: Log in to Shopify Admin

Go to https://admin.shopify.com and log in with your store owner account.

Step 2: Go to the Checkout settings

1. In the bottom-left corner, click Settings (gear icon ⚙️)
2. In the left-hand menu of the Settings page, click Checkout

Step 3: Configure customer contact methods

Scroll down to the Customer contact method section. You’ll see two options:

👉 Select "Phone number or email" and click Save.

Step 4: Require customers to enter a phone number at the shipping address

This is the most important step if you want to collect phone numbers for every order.

1. Still on the Settings > Checkout page, scroll down to the Customer information section
2. Find the " Shipping address phone number " field
3. Select Required or Optional and click Save