Authentication
Outbound Voice Platform requests authenticate with a user key. Field names are case sensitive.
ukey
ukey (string, required on lead upload) is the user authentication key. Send the canonical lower-case form ukey, not Ukey.
secretKey
On the Lead Action query string only, the same credential appears as secretKey (also seen documented as ukey). See Pause and Resume.
Case sensitivity
All parameter names, JSON keys and enumerated values are case sensitive. See Conventions.