Can we display the app in checkout pages?

Unfortunately, Shopify apps cannot run on checkout pages and for that reason, the app won't be displayed on the checkout page. 

This is a Shopify intentional policy, as stated at https://help.shopify.com/en/api/app-store/listing-in-the-app-store/app-requirements#a-security

Please note that this applies to all Shopify apps, not only ours.