@Deprecated
    public void setNumber(@Nullable String number) {
        this.number = number;
        this.brand = null;
        this.last4 = null;
    }
@ Deprecated public void setNumber ( @ Nullable String number ) { this . number = number ; this . brand = null ; this . last4 = null ; }
Setter for the card number. Note that mutating the number of this card object
invalidates the {@link #brand} and {@link #last4}.

@param number the new {@link #number}