Is there away way to integrate with Pendo and not create an issue, but to add the NPS response as a comment to an Issue. There is a field in the NPS that can drive the response to match a field in a project.
IE: Pendo Field - Location: 1234
JIRA Project - DSP, Customer Field "Location" = 1234
What functions does Pendo have for talking to Jira over a REST API?
Or are you looking for Jira to try to scrape information from Pendo to update its own?
Have you checked the marketplace for Pendo "integration" apps that might do what you need?