feat: add telnyx webhook api key in telephony config (#270)

api/services/telephony/providers/telnyx/__init__.py

@@ -27,6 +27,7 @@ def _config_loader(value: Dict[str, Any]) -> Dict[str, Any]:
         "provider": "telnyx",
         "api_key": value.get("api_key"),
         "connection_id": value.get("connection_id"),
+        "webhook_public_key": value.get("webhook_public_key"),
         "from_numbers": value.get("from_numbers", []),
     }
 
@@ -124,6 +125,18 @@ _UI_METADATA = ProviderUIMetadata(
                 "blank and we will auto-create one for you on save."
             ),
         ),
+        ProviderUIField(
+            name="webhook_public_key",
+            label="Webhook Public Key",
+            type="textarea",
+            required=False,
+            sensitive=False,
+            description=(
+                "Public key from Mission Control Portal → Keys & Credentials "
+                "→ Public Key. Used to verify Telnyx webhook signatures. "
+                "Without it, webhooks from Telnyx will be rejected."
+            ),
+        ),
         ProviderUIField(
             name="from_numbers",
             label="Phone Numbers",

api/services/telephony/providers/telnyx/config.py

@@ -18,6 +18,14 @@ class TelnyxConfigurationRequest(BaseModel):
             "stored on the configuration."
         ),
     )
+    webhook_public_key: Optional[str] = Field(
+        default=None,
+        description=(
+            "Webhook public key from Mission Control Portal → Keys & "
+            "Credentials → Public Key. Used to verify Telnyx webhook "
+            "signatures."
+        ),
+    )
     # Phone numbers are managed via the dedicated phone-numbers endpoints; the
     # legacy /telephony-config POST shim still accepts them inline.
     from_numbers: List[str] = Field(
@@ -31,4 +39,5 @@ class TelnyxConfigurationResponse(BaseModel):
     provider: Literal["telnyx"] = Field(default="telnyx")
     api_key: str  # Masked
     connection_id: Optional[str] = None
+    webhook_public_key: Optional[str] = None
     from_numbers: List[str]

api/services/telephony/providers/telnyx/provider.py

@@ -48,6 +48,7 @@ class TelnyxProvider(TelephonyProvider):
     def __init__(self, config: Dict[str, Any]):
         self.api_key = config.get("api_key")
         self.connection_id = config.get("connection_id")
+        self.webhook_public_key = config.get("webhook_public_key")
         self.from_numbers = config.get("from_numbers", [])
 
         if isinstance(self.from_numbers, str):