If you complete a course that offers a certificate during the 7 day free trial , do you need to pay an aditional free ?

For now I am auditing some courses that I would like to get a certificate and I would like to get the 7 day free trial to be able to get them but I am unsure of I do so and tbh I couldn't find concrete information for it
So far in some places I found
1) X you can take all certificates that you complete in the 7 day period
2) Y The course is paid separately plus you need to pay a certificate free
3) Z Only some courses gives you a certificate with the Coursera Plus Free 7 day trial

Anyone that can provide a little more information about this ? I will try soon regardless but I would like to know what to expect

Thank you in advance for responding , best regards