feat(router): Added amount conversion function in core for connector module

[sahkal]

Type of Change

• Enhancement

Description

Currently while sending amount to connector, connector does the conversion for all the flows

with this change we will make the amount conversion function as a part of core, where connector will send core in what format it needs the data in and core will do the conversion and connector needs to execute convert function to get that converted data.

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?

To Test this we can do a transaction with NMI and check NMI dashboard for the amount being sent.
note: NMI use currency as Major Unit

Flows to test :

• Normal Payments

curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_YNzUb5MTw5YJw8xiuqUMXUKyi4sZ3QEFClFLp39JbnWBR4Qi8Y6x6dRxyFs0S4bP' \
--data-raw '{
    "amount": 65401,
    "currency": "USD",
    "confirm": true,
    "customer_id": "StripeCustomer",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "three_ds",
    "return_url": "https://duck.com",
    "payment_method": "card",
    "payment_method_type":"credit",
    "payment_method_data": {
        "card": {
            "card_number": "4000000000002503",
            "card_exp_month": "04",
            "card_exp_year": "2026",
            "card_holder_name": "joseph Doe",
            "card_cvc": "323"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "sundari"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "sundari"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}
'

• Refunds

curl --location 'http://localhost:8080/refunds' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_YNzUb5MTw5YJw8xiuqUMXUKyi4sZ3QEFClFLp39JbnWBR4Qi8Y6x6dRxyFs0S4bP' \
--data '{
    "payment_id": "pay_Zvlokvy6pOKCeOvryAqV",
    "amount": 65401,
    "reason": "Customer returned product",
    "refund_type": "instant",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'

• Capture

curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_YNzUb5MTw5YJw8xiuqUMXUKyi4sZ3QEFClFLp39JbnWBR4Qi8Y6x6dRxyFs0S4bP' \
--data-raw '{
    "amount": 65401,
    "currency": "USD",
    "confirm": true,
    "capture_method": "manual",
    "amount_to_capture": 65401,
    "customer_id": "StripeCustomer",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "three_ds",
    "return_url": "https://duck.com",
    "payment_method": "card",
    "payment_method_type":"credit",
    "payment_method_data": {
        "card": {
            "card_number": "4000000000002503",
            "card_exp_month": "04",
            "card_exp_year": "2026",
            "card_holder_name": "joseph Doe",
            "card_cvc": "323"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "sundari"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "sundari"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }  
}
'

Capture Call

curl --location 'http://localhost:8080/payments/pay_DRwnnBM2UiZj7ZgsBapM/capture' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_YNzUb5MTw5YJw8xiuqUMXUKyi4sZ3QEFClFLp39JbnWBR4Qi8Y6x6dRxyFs0S4bP' \
--data '{
  "amount_to_capture": 65401
}'

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