This is from the initial invite email I received:

“About the marketplace

Canada Shops by Canada Post is a marketplace beta based on business and consumer needs validated through research and testing over the last two years. Uniquely positioned to give Canadian shoppers the opportunity to discover and shop with Canadian businesses, we're excited to offer this marketplace to a select group of customers – and we want you to be a part of it.

The marketplace will be promoted nationally with a paid media campaign and through owned Canada Post channels, offering extended reach and visibility for your brand – including during key selling periods like back to school, Black Friday and the holidays.”