I'm building a 2-sided marketplace wherein users can buy + sell advice, and pay for with micro-payments (Fiverr + Clarity = Wisewords.co) here in Canada. I'm pretty sure I need to hold the funds and let people build their balances before withdrawing, as most of their payments will be less than $10. Assuming I do hold funds, how big of an undertaking is it to hold funds for users? Are there many regulatory requirements? Any third-party services that do this in Canada?
Check out https://www.balancedpayments.com/
They are made for marketplaces.
Airbnb CEO among others invested in them and they have some of the best pricing/payout fees.
Also some good info on http://www.collaborativeconsumption.com/2013/10/08/online-marketplaces-are-hard/
One of Balanced Payments co-founders is writing this blog series on marketplaces.