Supplier links can be tested by appending &vtest=true to the end of the link before sending the survey link to the partner.
Supplier Link Testing:

For example, if the supplier link provided by Prodege peeq application is
http://www.prsrvy.com/g/survey-click/?projectid=12345&sourceid=1111&vpid=
append &vtest=true to the link to use the test link:
Example: http://www.prsrvy.com/g/survey-click/?projectid=12345&sourceid=1111&vpid=&vtest=true