The following events can be raised by the Android SDK. Gr4vyResult.TransactionCreated Returns data about the transaction object when the transaction was successfully created. 
{
  "transactionID": "8724fd24-5489-4a5d-90fd-0604df7d3b83",
  "status": "pending",
  "paymentMethodID": "17d57b9a-408d-49b8-9a97-9db382593003"
}
Gr4vyEvent.TransactionFailed Returned when the transaction encounters an error. 
{
  "transactionID": "8724fd24-5489-4a5d-90fd-0604df7d3b83",
  "status": "pending",
  "paymentMethodID": "17d57b9a-408d-49b8-9a97-9db382593003"
}
Gr4vyResult.Cancelled Returned when the user cancels/quits the SDK. Gr4vyResult.GeneralError Returned when the SDK encounters an error. 
{
  "Gr4vy Error: Failed to load"
}
Gr4vyEvent.CardDetailsChanged Returned when the card BIN changes in the form. It contains information on the inputted card, such as the BIN, card type and scheme. 
{
  "bin": "42424242",
  "scheme": "visa",
  "cardType": "debit"
}