Cisco Support APIs allow Cisco Partner Support Services (PSS) partners and Cisco Smart Net Total Care (SNTC) customers to programmatically access and consume Cisco Support data in the cloud in a simple, secure, and scalable manner.
Please access cisco Devnet and you will be able to find rich materials of suppport API.
Here is the link of support API at Devnet locatoin:
https://developer.cisco.com/site/support-apis/
Documents stored here:
https://developer.cisco.com/site/support-apis/docs/
