To use Purolator in Shippo, you will need to register on their Resource Center website and request a Production Key using the link below. You will be provided with a Production Key, Production Key Password, and an Account Number.
Purolator E-Ship Web Services Registration
Once registered, click on the "Ready for Production" button and follow the instructions on how to request the key (select the option: “I'm integrating Purolator E-Ship Web Services into a website or application that won’t be re-sold.”).
Once done, you will receive an email with your Production Key. Your Production Key will not be active immediately. As explained in the email, you should receive a call from Purolator within the next few days to activate it. If you do not hear from them you can reach them at 1-800-459-5599. Once activated, it will be ready to use in Shippo.
Please follow the steps to connect here—Carriers Supported by Shippo.