When filling out the trade account application the applicant picks from the list of directors/ shareholders the guarantor(s) to nominate and inputs their email address(es) on the form or if they are the director/ shareholder of the company - they can just tick a box to state so & accept /decline the guarantee when filling out the online application.
When the applicant submits the trade account application the nominated guarantor(s) receives Personal guarantee email invite that they action to either accept or decline to guarantee. Each guarantor is given view access to the trade account application and its credit limit when they are completing the guarantee. Once the application is approved by the supplier the guarantor is emailed a PDF copy of the trade credit contract.
Please note - Sole traders, trustees of an unincorporated trust & personal applicants are automatically liable ie do not sign personal guarantee.