According to the Ecommerce Bridge documentation, the integratorObjectId is a string with a max length of 100 characters. Does that mean that I can use an e-mail address as the integratorObjectId when working with Contacts?
Theoretically that would probably work, but I'm not sure it's the best idea. HubSpot already does deduplication for contacts based on email; is there a reason you're looking to use an email address as the integratorObjectId?