[PW-2681] Add http response headers to PaymentResponse and ModificationResult

[MikhailShumenko]

Describe the bug We are going to integrate with Adyen idempotent payment solution: https://docs.adyen.com/development-resources/api-idempotency?tab=%23codeBlockIp5yV_bash#enable-idempotency

To verify that a request was processed idempotently, check the Idempotency-Key HTTP header returned in the response.

As described in docs we can verify that a request was processed idempotently by checking response headers, but there is no ability to get response headers from com.adyen.model.checkout.PaymentsResponse.

Expected behavior Cloud you please add response headers to the PaymentsResponse, as you do for https://github.com/Adyen/adyen-java-api-library/pull/288/files#diff-95b172d74ebd7d1c534673475eb29d37R37

[Aleffio]

Hi @MikhailShumenko ,

Thank you for reporting the issue, I added an internal ticket to work on the headers.

Regards, Alessio Adyen

[viatra2]

@Aleffio Any updates on this? Could you advise some workaround on how to identify duplicated headers?

[jillingk]

Closing this ticket as the issue has been solved.