Pay as you go

I am constantly starting and stopping my subscription to Docusign.  It’d be nice if you offered a pay as you go option.  Or at least automatic renewal an option, not a requirement.  I know you get more from people who don’t cancel right away whether they’re using the account or not, but it would do me more service to either pay for a signal month when I need it, or my best idea is to pay per signature, like a notary, since that’s really what you guys are.