It depends... You would need to look at Canada's export laws, and the import laws of the countries you wish to sell into. It also depends upon the rest of the circuitry. If its all analog, its not too big a deal... if you have a microprocessor, then you will most likely need to run tests at an accredited lab, build a technical file, and jump some paper work hoops. Bear in mind, there are tons of non-certified products from China being sold all over the world... many of which are well engineered and solid, a few of which burst into flame and/or shock their users.
There are somewhat global standards... one set of lab tests, followed by technical files/reports tailored to each standards criteria. Some standards are fairly widely accepted, such that if you have CE, you are widely covered, others are more narrow in scope (and usually cheaper).
CSA as a starting point **broken link removed**
TUV is global
https://tuvcanada.ca/newhome.cfm
As long as your circuitry is analog, you are for the most part pretty safe with a good high quality certified wall wart. Digital usually equates to additional EMC susceptibility and emissions testing, and if can take a few iterations to get your unit to pass. Safety testing is usually a verification that you followed the standards... but not always. If surge testing is required, it can take a few iterations of charred and melted units to get things nailed down.
There are lots of gotchas in this arena... rules of thumb often hit 99%, but the 1% can be an expensive gotcha.