Enabling PayPal, Google Pay, and Apple Pay Integration through Braintree in GraphCommerce Frontend Server

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Question:
I've successfully set up Braintree in my Magento server and installed the magento-payment-braintree package. Now, I'm looking to add support for PayPal, Google Pay, and Apple Pay through Braintree in the GraphCommerce frontend server. However, these payment methods appear to be disabled in the checkout page. How can I enable them or ensure that they are properly integrated into the checkout process?