If set to 1 the address passed in via Zen Cart will override the customer PayPal-stored address. The customer will be shown their address from Zen Cart, but will not be able to edit it. If the address is not valid (i.e. missing required fields, including country) or not included, then no address will be shown.<br />Empty=No Override<br />1=Passed-in Address overrides customers PayPal-stored address