Version 3.5.0 (Need help)

Where Amazon have made new changes to there system according to github:

• Add support for ‘Amazon Pay Strong Customer Authentication (SCA) Upgrade’ fields in ConfirmOrderReference API.
• Add support for Supplementary data in CreateOrderReferenceForId and AuthorizeOnBillingAgreement APIs.
• Add getters for refundedAmount and refundedAmountCurrencyCode in CaptureResponse.

How do I add this to my code base, I am already using amazon pay currently but am confused how I can push the new change.