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Yes, CardinalMobileSDK supports both JAVA as well as Kotlin. Code snippet of each programming languages can be found in the documentation.

Yes, CardinalMobileSDK uses Nimbus JOSE+JWT for encryption/ decryption. These need to add in your Gradel dependencies.

The downloaded framework file size is 252KB. Once integrated with the app, it adds 190KB to the total size.

You can also download .aar file directly from Jfrog by navigating into the package and clicking cardinalmobilesdk-*.*.*-*.aar file under Direct Downloads section as shown below.

Image Added

Change the import statements as follows :

import com.cardinalcommerce.cardinalmobilesdk.models.response.CardinalActionCode
import com.cardinalcommerce.cardinalmobilesdk.models.response.ValidateResponse

import com.cardinalcommerce.shared.models.parameters.CardinalConfigurationParameters
import com.cardinalcommerce.shared.models.parameters.CardinalEnvironment
import com.cardinalcommerce.shared.models.parameters.CardinalRenderType
import com.cardinalcommerce.shared.models.parameters.CardinalUiType

to 

mport com.cardinalcommerce.cardinalmobilesdk.enums.CardinalEnvironment
import com.cardinalcommerce.cardinalmobilesdk.enums.CardinalRenderType
import com.cardinalcommerce.cardinalmobilesdk.enums.CardinalUiType
import com.cardinalcommerce.cardinalmobilesdk.models.CardinalActionCode
import com.cardinalcommerce.cardinalmobilesdk.models.CardinalConfigurationParameters
import com.cardinalcommerce.cardinalmobilesdk.models.ValidateResponse

No, if you are using staging credential make sure SDK config is set to Staging Environment and switch back to Production Environment when moving to production. SDK is configured to Production Environment by default.

Yes, you can customize the certain aspect of Challenge Screen by setting the UICustomization in SDK Config. See  UI Customization v2.1.3 for details.

You should verify the following:

1. Copy your .ttf file to “font” folder under “assets” in the main directory
   1. If you don’t already have an assets file, right click on the main directory | New | Android Resource Directory
      - Directory name: assets
      - Directory type: assets
      - Source Set: main
      - Once the directory is created, right click | New | Android Resource Directory |
      - Directory name: font
      - Directory Type: font
      - Source Set: main
2.  Once you have verified you have your font in the right place, Pass in fontName as “font/font_name.ttf”
   1. eg. buttonCustomization.setTextFontName(“font/walkwayblack.ttf”);

Yes, you can set enableDFSync to true in SDK Config to get Setup Completion Handler called after Data Collection is complete. enableDFSync is set to false by default.

JWT might be invalid if the credentials in the JWT like OrgUnitID, APIKey, APIIdentifiers are invalid or the JWT has expired. Also, make sure the credentials in the JWT point to the correct environment that SDK is set to in the config.

By default, no. If you want Setup to be successful only after Device Data collection is complete, then enable DF Sync in the SDK Config.

OnValidated handler of the Setup will be called with the corresponding error message. 

If you start ProcessBin without successful completion of Setup/Init, then ProcessBin cannot be completed. Please check the console log for error details.

If the parameter you passed to the continue, like TransactionId or Payload is invalid then, continue will throw an error.

Make sure the ThreeDSVersoin of the lookup response matches with what SDK Supports. SDK does not support 1.0 Payload.

After all initial setup, in continue pass a sample payload of various UI Types to test different UI in Challenge Screens. You can get the sample payload for various UI type from Sample Payload for Various UI Types.

No. It means the authentication failed based on the data user provided.