CardForm.DropInActivity with specified options.DropInActivity or calling
DropInResult.fetchDropInResult(AppCompatActivity, String, DropInResultListener).DropInResult in an Intent in
AppCompatActivity#onActivityResult(int, int, Intent)DropInActivity.onActivityResult(int, int, android.content.Intent) if
responseCode is not #RESULT_OK or
#RESULT_CANCELED.Intent that can be used in androidx.appcompat.app.AppCompatActivity#startActivityForResult(Intent, int)
to launch DropInActivity and the Drop-in UI.DropInResult.fetchDropInResult(AppCompatActivity, String, DropInResultListener) will be
returned here.DropInRequest.amount(String) or a ThreeDSecureRequest is provided,
Drop-In will request a 3D Secure verification for any new cards added by the user.