1. Different API for the Outbound message processing

This concept is about outbound interface processing. The real-time outbound interface can be done in different ways i.e Using a button, Using trigger, Using the process builder. For outbound processing, we have two categories: Synchronous:- Apex code wait for the response of the HTTP callout. Asynchronous:- Apex code doesn’t wait for the response of the HTTP callout. It can have a response which is an asynchronous response. This response can come at any time. InvokeCallout2() method supports   SAP, SAP-PI, SAP-R/3, SFDC2SAPPI, SOAP, REST adapter types. The response could be a text of JSON, XML, List> based on given flag parameters in CallOutControl and Apex of each adapter handle setting when execute callout.  InvokeCallout2() method support different mode:

1. SYNC
2. FUTURE
3. BATCH
4. AUTO

We get a real-time response in SYNC mode only. Different API for the inbound message processing:

1. Invoke callout

2.Invoke callout2

1. Invoke callout3
2. Different way how to invoke outbound interface
3. Process Builder:
4. Button
5. Trigger
6. Apex Class
7. Flow