You can activate all  payment methods (and their logs) from your Shopify account as shown below:

However, showing these icons beside our Paytabs logo is limited by exact numbers and orders that are managed ONLY from the Shopify's side

ApplePay Logo icon/logo won't appear on Shopify plugin during the checkout process.

Paytabs has no upper hand/access to modify the logo, yet ApplePay will automatically show on Paytabs Payment Page itself. 

To facilitate Apple Pay payments, please ensure Apple devices are being used; i.e: iPhone/safari browser.