IssueTracker

What you would like to accomplish:

API for Marketplace to programmatically update listings for automation purposes following Marketplace Partner Portal guides.

How this might work:
It should allow to perform the listing updates using an API in order to have the listings updated automatically.

If applicable, reasons why alternative solutions are not sufficient:
N/A

Other information (workarounds you have tried, documentation consulted, etc):
https://cloud.google.com/marketplace/docs/partners/commerce-procurement-api/reference (this option does not include the way to update or manage the listings.