refactor(payment_link): add Miscellaneous charges in cart

[sahkal]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

added Miscellaneous charges in cart

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Do Payment Create using the below curl, and look for Miscellaneous charges which must include the (amount - sum of all the order_details product charges).

curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_ShWRM578WKdafb8q56e7i4pZ44dyXzaidU9EIpIGaBMSjHR1aDM1MQFEllYs1eIs' \
--data '{
    "amount": 710,
    "currency": "USD",
    
    "customer_id": "sahkal",
    "return_url": "https://google.com",
    
    "description": "For selling Tea",
    "capture_method": "automatic",
    "authentication_type": "no_three_ds",
    "order_details": [
        {
            "product_name": "Tea",
            "quantity": 1,
            "amount": 110,
            "product_img_link": "https://thumbs.dreamstime.com/b/indian-tea-spices-masala-chai-33827904.jpg"
        },
        {
            "product_name": "Tea",
            "quantity": 1,
            "amount": 110,
            "product_img_link": "https://thumbs.dreamstime.com/b/indian-tea-spices-masala-chai-33827904.jpg"
        },
        {
            "product_name": "Tea",
            "quantity": 1,
            "amount": 110,
            "product_img_link": "https://thumbs.dreamstime.com/b/indian-tea-spices-masala-chai-33827904.jpg"
        }
    ],
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "sahkal",
            "last_name":"poddar"
        }
    },
    "payment_link": true
}'

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable