Marketpress- Gateway Permissions and non-supporter chained payments question

Hey guys-
I am experimenting with adding a non-supporter chained payment option to my Marketpress plugin (hopefully allowing my customers the option to a. run their own store and pay a small transaction fee (%) OR b. have me list their products and promote their store for a higher fee (%). I have 2 questions about settings and permissions: I have all gateway permissions set to "no access"....is this correct? Also, can I use the same app id and api credentials for the non-supporter option or will I have to apply for a new api? many many thanks :slight_smile: