Help me implement Braintree Payment Gateway

I am in the process of creating an e-commerce store but having difficulties setting up all the payment options I need on my react site. I'm looking for someone experienced in setting up Braintree Payments the correct way so I can be sure my payment processing is secure. I'm using Braintree Payment and am looking to add Credit Card, PayPal, Apple pay, and Samsung pay to my site. I already have a Braintree account and have set up bt drop-in for credit card and PayPal but I have some problems with it not loading when users come to my Place Order Page for the first time. I also want an individual PayPal component that I can drop into my cart page for express checkout as well on each product page. So overall this is what I need:

- A standalone PayPal checkout component
- Vault Integration
- Apple Pay Integration
- Samsung Pay Intergration
- Error handling for failed payments
- Card Validations
- Help to fix my current BT Dropin implementation