public void createToken(@NonNull final Card card, @NonNull final TokenCallback callback) {
        createToken(card, mDefaultPublishableKey, callback);
    }
public void createToken ( @ NonNull final Card card , @ NonNull final TokenCallback callback ) { createToken ( card , mDefaultPublishableKey , callback ) ; }
The simplest way to create a token, using a {@link Card} and {@link TokenCallback}. This
runs on the default {@link Executor} and with the
currently set {@link #mDefaultPublishableKey}.

@param card the {@link Card} used to create this payment token
@param callback a {@link TokenCallback} to receive either the token or an error