Don't worry! You can retrieve your card pin by calling +1-647-361-5601, have the Member Care Specialist transfer you to the automated phone system to retrieve your PIN.
If you're within Canada and USA, you can call it directly at 1-877-782-2501 however this number is only valid from within Canada or USA.
Once you're in the automated phone system, you enter in your 16-digit card number followed by the # key, and then press * (star) and validate yourself by providing your information (date of birth and card expiry date). The interactive voice response system will disclose the PIN to you once you have been validated.
Please note, your card PIN is not the same as your STACK app PIN.