ApiTaskResult<T>	A representation of the result of a`Task`,which includes additional information about the outcome of the execution.
TaskResultContracts	A collection of`ActivityResultContract`s to resolve`Task` objects.
TaskResultContracts.GetApiTaskResult<T>	A contract that takes a`Task<T>` and yields an`ApiTaskResult<T>` with the result and additional information about the operation.
TaskResultContracts.GetPaymentData	A simple contract that returns a`PaymentData` object.
TaskResultContracts.GetPaymentDataResult	A simple contract based on`TaskResultContracts.GetApiTaskResult`that returns a wrapper including a `PaymentData` object and additional information about the`Task` operation.
TaskResultContracts.ResolveApiTaskResult<I, O>	A contract that takes a`Task<I>` and yields a result`O`.
TaskResultContracts.UnpackApiTaskResult<T>	A contract that takes a`Task<T>` and optionally returns its result`T?`if the task completes successfully.

com.google.android.gms.wallet.contract