Store Applications Certification Process
What does the certification look like for apps you want to publish in the ServiceNow Store?
Here are some helpful videos that walk through the steps for certification:
Getting Your App Ready for ServiceNow Store Certification
ServiceNow Store Certification Process
And here is a link to a post on the 'Certification Pre-Test' tool you most likely have in your developer instance (vendor instances only, venXXXX)
Certification Pre-Test Tool