Contract management
Create a full document management suit that links into invoicing including agreed increases reminders and renewals. Look at a integrated solution with online signing ability like Videosign: https://www.videosign.co.uk/

Hi team we appreciate support in this idea, however as previously shared we don't have any current plans for extending files to accommodate what's being asked here.
We're continuing to keep a watch on the support for this, and recommend exploring the Xero app store if this is something you need right now.
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Waves of Harmony Pty Ltd commented
have a service agreement template - with ability to date and sign
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Pinar Genc commented
I would even bring this down to esigniture with link to take payment at time of signature