Salesforce Exam PDII Topic 1 Question 6 Discussion

The Salesforce instance at Universal Containers currently integrates with a third-party company to validate mailing addresses via REST services. The third-party address verification system recently changed endpoint URLs for all their set vices from https://th-addreaa-service.3pc.com to https://plc1-mailsarvice.3pc.com. Everything else remained the same. The developer updated code to reflect this endpoint change, but the mailing address validation service stopped working after the change.

What else should be done to complete this web service end point change?