How to use Converge with Purple Dot
Shopify stores
How you need to use Purple Dot with Converge depends on whether Purple Dot is integrated into your Shopify store as separate checkout or as a payment provider inside Shopify's checkout. See more here to learn about these two options.
As payment provider inside Shopify checkout
No extra setup is required. The same events/tracking that already works for your regular sales will work for pre-orders also.
As separate checkout
If "Send placed pre-order events" is turned on then Purple Dot will send Converge an event with the specified name every time some shopper buys a pre-order through the Purple Dot checkout. That event gives a lot of information about what has been purchased, see the event description here.