Auxiliary emails can be used in LegFi to let a secondary email receive the same communication and invoices from your organization. For emailed invoices specifically, any email that receives that invoice can use the guest login to pay by card via the custom account link provided.
Only the primary email used to login to LegFi will be able to pay via e-check.
To add an auxiliary(secondary) email address go to the member's account dashboard> Action> Edit User> Add Auxiliary Email.