Upsell Purchase Triggers A Rental Agreement

Some users have upsell add-ons that require a signed agreement (e.g. boat dock rental, kayaks, golf carts) or that may need an agreement with their condo/homeowners association. Would be helpful to have a purchased upsell automatically trigger a rental agreement to the guest so users don't have to use third-party software to get the agreement signed. This is especially important for OTA guests where third-party links (not our guest portal) can be flagged.