I just read section 290.110 on the moga website and I'm a bit confused. Does it say that your employer must provide your final paycheck at the time you're fired or do they have up to a week to produce it? Also, I'm in a union so does that effect it in any way?

Wages must be paid on the final day of work. The 7 days comes into play when, if the employer does not pay on the final day of work, you have sent a letter requesting the pay and they haven't responded/paid you within 7 days from their receipt of your letter. At that point, your only recourse would be to file civilly, likely the amount would be within the threshold for small claims court.

Okay, thank you very much for clearing that up! :)