fix(connector): fix amount conversion incase of minor unit

[srujanchikke]

Type of Change

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

Description

Incase of minor unit if connector uses get_amount_as_string function , instead of directly converting amount-i64 to string we are checking the decimal unit by using function to_currency_lower_unit .This is will multiply the amount by 100 if connector accepts amount as string and minor .This pr will fix this issue .

Additional Changes

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

Motivation and Context

Incase of minor unit if connector uses get_amount_as_string function , instead of directly converting amount-i64 to string we are checking the decimal unit by using function to_currency_lower_unit .This is will multiply the amount by 100 if connector accepts amount as string and minor .This pr will fix this issue .

How did you test it?

Test cybersource amount conversion .

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