PayUCheckoutPro SDK for iOS
Integration Doc can be found here - https://devguide.payu.in/mobile-sdk-ios/payucheckoutpro/
For hash generation testing salt needs to be put in HASH generation method and one set of test creds can be found on Devguide - https://devguide.payu.in/mobile-sdk-ios/getting-started-with-ios-sdk/mobile-sdk-test-environment/