01Define the boundary
Identify the actor, target resource and operation that custom sms provider is meant to govern.
02Configure the policy
Validate provider credentials, sender/region configuration and delivery errors. Classify SMS according to the authentication policy, apply operation limits and avoid making SMS the sole recovery route for privileged identities.
03Exercise the edge cases
An SMS OTP is delivered through the configured provider, but a privileged action still evaluates the required assurance level and other controls. Also test the path that should be denied, deferred or sent for review.
04Review the outcome
Check that the resulting state is understandable and that the decision can be investigated later. For audit-enabled operations, confirm the relevant actor and context are captured.