Rest API Monitoring uses HTTP requests to access and use data as the main protocol.
That data can be GET, PUT, POST AND DELETE data classification!
https://www.ciscopress.com/articles/article.asp?p=3145761&seqNum=6

The tloc-extension command in Cisco SD-WAN (vEdge) configuration is used to extend the Transport Locator (TLOC) from one interface to another. This is typically done to bind interfaces that might be on different physical networks but should be treated as if they are on the same transport.
Looking at the configuration in the exhibit:
- The interface ge0/2.101 is being configured.
- The tloc-extension ge0/0 command binds the TLOC of ge0/0 to ge0/2.101.
For the TLOC extension, the binding is typically between a transport interface and another interface that is not a transport interface. This allows the interface ge0/2.101 to utilize the TLOC of ge0/0 to communicate across the SD-WAN fabric.

Explanation
https://sdwan-docs.cisco.com/Product_Documentation/Software_Features/SD-WAN_Release_16.3/02System_an

The fundamental purpose of Rest-APIs is providing a grouped specific rich resource that provides the output required.
Rest Application Programming Interface uses four methods to communicate with objects which are GET | POST | PUT | DELETE The majority of API's use JavaScript Object Notation, dialectally known as JSON, these objects collect then communicates with data (GE, POST, PUT, DELETE).
The data within a JSON can be number, string, boolean, null values, or an ordered list of values, or unordered set of key value pairs.
Single values is termed Scalar data types
A list of values is termed an Array
Unordered set of keys, value pairs, attributes (Not XML attributes) are termed Objects