How do I invite a supplier to register? November 01, 2019 20:42 Updated Click on Invite Supplier to invite a supplier to register and submit their information. How to invite suppliers to register from Admin supplier.io on Vimeo. Related articles How do I register as a supplier? How do I track my current supplier's certification status? How SIO Can Help You Source Diverse Suppliers How do I subscribe to monthly newsletters? How to open a reporting period?