The community is also a great place to check out. Try these places for help from other users:
Please review the Third-Party Game Support topic to determine whether your question should be directed to the game developer or to Steam Support. Sending a support request to the wrong party may result in a delay in processing your request.
Retail CD-Keys for this game cannot be registered through Steam. If you wish to create a shortcut to this game under your Library, instructions can be found here:
If you're encountering issues when launching or playing PAYDAY: The Heist, make sure everything installed correctly.
Exit Steam entirely.
Browse to your PAYDAY: The Heist installation folder (Usually C:\Program Files\Steam\steamapps\common\payday the heist\
Run the following installers:
Reboot your computer and test the issue again. If the issue persists, contact PAYDAY: The Heist support.