The Product ID is available in 2 spots:
- In Partner Center > Marketplace > Discover Products; search for the product name and click to view the product marketing material. See the page URL, the Product ID will show as starting with MP such as MP-QQF46WQ8W4TXTD8CBX8P6X7XBV4KBNW4.
- Still, under the Marketplace tab > click on Products, select a product and see the page URL, the Product ID will show as starting with MP.
Similarly for packages, under Marketplace > Manage Store when you choose a package, the URL will have a portion that starts with SOL-{letters and number}, that is the package ID.