To use an API Token obtained from VCO, set the following in the Postman Headers section.
KEY → Authorization
Value → Token <your token>
The Authentication section of the API reference may also be helpful.
VMware SD-WAN Orchestrator API v1
https://developer.vmware.com/apis/1237
VMware SD-WAN Orchestration API v2
https://developer.vmware.com/apis/vmware-sase-platform/vmware-sdwan/latest/
If you do not use API Token, the following videos and blogs are very useful.
VMware SD-WAN Orchestrator API Overview and Demo
https://youtu.be/AG_P766q4bU
VMware SD-WAN Orchestrator API Overview and Demo
https://youtu.be/A5KMMDIUEog
VMware Japan Blog
https://blogs.vmware.com/vmware-japan/2020/10/way2vcn_sd-wan_ui2.html