createGiropayParams  
  fun createGiropayParams(@IntRange(from = 0)  amount: Long, name: String, returnUrl: String, statementDescriptor: String? = null): SourceParams
Create Giropay Source params.
Return
a SourceParams object that can be used to create a Giropay source
Parameters
amount
A positive integer in the smallest currency unit representing the amount to charge the customer (e.g., 1099 for a €10.99 payment).
name
The full name of the account holder.
returnUrl 
The URL the customer should be redirected to after the authorization process.
statementDescriptor 
A custom statement descriptor for the payment (optional).