Unless you have a legal obligation to be VAT registered you can say to CJ that you don't have a VAT number and they will accept your application.
In the UK the VAT-registration threshold is a turnover of GBP 64,00 - you'll have to check what the threshold is in Canada.
In any case the VAT that you pay will not amount to anything extra anyway.
If, in the UK, where VAT is 17.5%, you earn GBP 100 from a merchant, they will pay you GBP 117.50 and you will pay GBP 17.50 to the government. You still get the GBP 100.
With VAT you act as a tax collector. (But, crucially, not a tax payer - only the end customer actually pays VAT).
Customer pays merchant [sale price] + [VAT]
Merchant pays you [10% of sale price] + [10% of VAT]
You pay government [10% of VAT]
The VAT paid by the customer has been collected by the merchant, passed on to you and you have passed it on to the government.
It took me years to understand this.
Sorry, I know that's UK-specific and you need something Canada-specific, but that should help to illustrate the general principles at any rate.