PayPal Provider

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Description

Added implementation of a payment provider service using Paypal's Checkout Server SDK.

• ProviderService Class: extends an abstract service and implements a payment interface. It has two main methods: createACheckoutSession and checkRequestAndReturnDetails.

• createACheckoutSession Method: creates a new checkout session for a transaction, sets up the details of the transaction, such as the amount and currency, and then sends a request to PayPal to create a new order. If successful, it returns the order ID.

• checkRequestAndReturnDetails Method: This method takes a request (which should contain an order ID) and sends a request to PayPal to get the details of that order. If successful, it returns the order details.

• client Function: a helper function that creates and returns a new instance of PayPalHttpClient.

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Issue Ticket Number

Fixes #4

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Type of change

• Bug fix
• New Provider
• Styling
• New Feature

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Checklist:

• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

[0vol]

Dependency: @paypal/checkout-server-sdk - For interacting with PayPal's Checkout APIs