For general guidelines for setting secure credentials and setting them in the UI, see Secure credentials.
For general rules about this feature, see the secure credentials requirements.
API requirements and rules include:
- See general Synthetics REST API requirements.
- An account's rate of requests is limited to three requests per second. Requests that exceed this threshold will return a 429 response code.
- A key's value cannot be accessed via the API; an unauthorized user would not have access to the secure key values.