Northern Trail Outfitters (NTO) has hired an Integration Architect to design the integrations between existing systems and a new instance of Salesforce. NTO has the following requirements:
1. Initial load of 2M Accounts, 5.5M Contacts, 4.3M Opportunities, and 45k Products into the new org.
2. Notification of new and updated Accounts and Contacts needs to be sent to 3 external systems.
3. Expose custom business logic to 5 external applications in a highly secure manner.
4. Schedule nightly automated dataflows, recipes and data syncs.
Which set of APIs are recommended in order to meet the requirements?