1. Objective

• Send notification email to merchant once change order status to processing depending on payment method.

Related information:
Related PR(s): #232

2. Description of change

Override Woocommerce filter for woocommerce_email_recipient_new_order which able to initiate with status as on-hold to not send order email to merchant.
Override woocommerce_order_status_processing to send notification email depend on payment method

3. Quality assurance

• no email send to merchant on complete checkout screen
• found single email send to merchant when change order status to processing
• new order email to customer both status as on-hold and processing

🔧 Environments:

Tested locally by pointing OMISE_API_URL to staging-omise

WooCommerce: v5.7.1
WordPress: v5.8
PHP version: 7.1

✏️ Details:

Make sure setting merchant email at /wp-admin/admin.php?page=wc-settings&tab=email&section=wc_email_new_order or /wp-admin/admin.php?page=wc-settings&tab=email to your valid email
Checkout cart with Paynow payment make sure customer email is valid and accessible
Go to customer mail box should still receive new order email
Go to merchant mail box should not receive new order email
Checkout cart with Credit Card and accessible
Go to customer mail box should still receive new order email
Go to merchant mail box should still receive new order email

4. Impact of the change
   No

5. Priority of change
   Normal

6. Additional Notes
   No