Submit your API to Zapier.com
This would allow TSheets to instantly work with SO many other services AND customers without the need for complicated/custom programming.
As for a new integration JumpStart Development LLC recently released GraviTsheets. It is a lightning fast solution that allows unassigned shifts to be created instantly from Gravity Forms submissions. This is a great low cost solution for field service and lead generation companies. 7 Day Free Trial No Credit Card Required! Visit us at https://gravitsheets.com. GraviTsheets also has the option for customer service follow-up shifts to be instantly created.
I would have heartily recommended Tsheets to one of my large clients however because of lack of Zapier integration I am looking elsewhere. Is Zapier integration ever likely to be added?
Sam Johnson commented
Here's how a range of other time tracking tools work with todoist via Zapier. https://zapier.com/blog/todoist-integrations/#completed. This request might have few votes from existing users, but don't under estimate Zapier's potential to help you reach new customers in new markets.
I have a client using tsheets currently but due to the lack of zapier integration have asked me to move them to a competing product. They are moving everything to the cloud and don't want to maintain a local server just got API integrations.