How do I manage all the invoices that I have sent? Ben Flores November 17, 2016 01:52 Updated Follow You can manage your invoices both from the Flint mobile app as well as the Flint merchant portal. Related articles Can I receive a copy of my invoice sent? How do I contact Flint Support from the app? Do I receive a 1099-K? Can I process cards over the phone? How do I update my Flint App? Comments 0 comments Article is closed for comments.