refactor(connector): Add amount conversion framework to iatapay along with amount conversion code to connector template

[sahkal]

Type of Change

• Refactoring

Description

This PR adds amount conversion framework to IATAPAY

Note: Iatapay works in BaseUnit

along with amount conversion code to connector template

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?

Flows to test in Iatapay

• Authorise
• Refunds

Authorise

curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_Nd3DS0gJ86yv7JFEAvLWu4C4KHcSxDSLFu6604K7ugoCz2kWvWhxtG4jlc1TtpjD' \
--data-raw '{
  "amount": 5000,
  "currency": "INR",
  "confirm": true,
  "capture_method": "automatic",
  "capture_on": "2022-09-10T10:11:12Z",
  "amount_to_capture": 5000,
  "customer_id": "IatapayCustomer",
  "email": "[email protected]",
  "name": "John Doe",
  "phone": "999999999",
  "phone_country_code": "+1",
  "description": "Its my first payment request",
  "authentication_type": "no_three_ds",
  "return_url": "https://google.com",
  "payment_method": "upi",
  "payment_method_type": "upi_collect",
  "payment_method_data": {
    "upi": {
        "upi_collect": {
      "vpa_id": "successtest@iata"
    }}
  },
  "billing": {
    "address": {
      "line1": "1467",
      "line2": "Harrison Street",
      "line3": "Harrison Street",
      "city": "San Fransico",
      "state": "California",
      "zip": "94122",
      "country": "IN",
      "first_name": "joseph",
      "last_name": "Doe"
    },
    "phone": {
      "number": "8056594427",
      "country_code": "+91"
    }
  },
  "shipping": {
    "address": {
      "line1": "1467",
      "line2": "Harrison Street",
      "line3": "Harrison Street",
      "city": "San Fransico",
      "state": "California",
      "zip": "94122",
      "country": "US",
      "first_name": "joseph",
      "last_name": "Doe"
    },
    "phone": {
      "number": "8056594427",
      "country_code": "+91"
    }
  },
  "statement_descriptor_name": "joseph",
  "statement_descriptor_suffix": "JS",
  "metadata": {
    "udf1": "value1",
    "new_customer": "true",
    "login_date": "2019-09-10T10:11:12Z"
  }
}
'

Refund

curl --location 'http://localhost:8080/refunds' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_Nd3DS0gJ86yv7JFEAvLWu4C4KHcSxDSLFu6604K7ugoCz2kWvWhxtG4jlc1TtpjD' \
--data '{
    "payment_id": "pay_nZRsJclloYDBsyqYiF2Q",
    "amount": 5000,
    "reason": "Customer returned product",
    "refund_type": "instant",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'

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

The base branch was changed.