Explanation:

Box 1: custom service
Custom service peak data volume is 1,000 records per hour.
Box 2: batch data API
This scenario is best implemented by using batch data APIs, which has a peak data volume of 300,000 records per hour.
Box 3: OData endpoint
Peak data volume for reading Odata status of orders is 5,000 records per hour.
This scenario is best implemented by using the OData service endpoints to read order status information.
Reference:
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/integration-overview