Final answer:
The two types of calls that can be developed using Apigee SDK are synchronous calls and asynchronous calls.
Step-by-step explanation:
The two types of calls that can be developed using Apigee SDK are Synchronous calls and Asynchronous calls.
Synchronous calls are blocking calls where the program waits for a response before proceeding. These calls are used when the response from the server is required immediately to continue the program.
Asynchronous calls are non-blocking calls where the program continues to execute without waiting for a response. A callback function is used to handle the response once it is received. These calls are used when the response time may vary and the program can proceed without the immediate response.