What are two ways to use Marketing Cloud Connect (MCC) and Journey Builder together to...

Use a Sales Cloud Journey Builder entry source to inject new Contact records directly into Journey Builder.

Create an API integration from custom eCommerce platform directly to JB for new Contacts. Use EmallAddress as the SubscriberKey.

Create an API integration from custom eCommerce platform directly to Sales Cloud for new Contacts.

Use a query activity to identify new records in the Contact Synchronized Data Extension, write results to new sendable DE, and schedule an automation to inject every 15 minutes.