If you're having an issue where you need to sign in to PartsTech every time you open up the punch out to add parts it may be an issue with the new version of google chrome (version 80)
Work Around / Fix
PartsTech and your management system needs a certain types of browsing cookies disabled in order to keep you logged in.
Step 1: Open up a new chrome tab.
Step 2: Navigate to chrome://flags/
Step 3: Use the search bar to search for "same site"
Step 4: Find the "SameSite by default cookies" option.
Step 5: Set this flag to disabled.
This should resolve this issue you may have to sign in one more time when you open up the PartsTech punch-out. If the problem persist please contact PartsTech support.