feat: [recaptchaenterprise] added SMS Toll Fraud assessment (#5499)

* feat: added SMS Toll Fraud assessment

PiperOrigin-RevId: 646633568

Source-Link: googleapis/googleapis@76b2166

Source-Link: googleapis/googleapis-gen@c68010a
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLXJlY2FwdGNoYWVudGVycHJpc2UvLk93bEJvdC55YW1sIiwiaCI6ImM2ODAxMGFhZGIyNDg2YWFmODI4YWJmNzY2Y2I4YmU2ZmI3YzUyZmEifQ==

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

packages/google-cloud-recaptchaenterprise/protos/google/cloud/recaptchaenterprise/v1/recaptchaenterprise.proto

@@ -649,6 +649,12 @@ message Assessment {
   // Output only. Fraud Signals specific to the users involved in a payment
   // transaction.
   FraudSignals fraud_signals = 13 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Assessment returned when a site key, a token, and a phone
+  // number as `user_id` are provided. Account defender and SMS toll fraud
+  // protection need to be enabled.
+  PhoneFraudAssessment phone_fraud_assessment = 12
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // The event being assessed.
@@ -1116,6 +1122,33 @@ message FraudSignals {
   CardSignals card_signals = 2 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
+// Information about SMS toll fraud.
+message SmsTollFraudVerdict {
+  // Reasons contributing to the SMS toll fraud verdict.
+  enum SmsTollFraudReason {
+    // Default unspecified reason
+    SMS_TOLL_FRAUD_REASON_UNSPECIFIED = 0;
+
+    // The provided phone number was invalid
+    INVALID_PHONE_NUMBER = 1;
+  }
+
+  // Output only. Probability of an SMS event being fraudulent.
+  // Values are from 0.0 (lowest) to 1.0 (highest).
+  float risk = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Reasons contributing to the SMS toll fraud verdict.
+  repeated SmsTollFraudReason reasons = 2
+      [(google.api.field_behavior) = OUTPUT_ONLY];
+}
+
+// Assessment for Phone Fraud
+message PhoneFraudAssessment {
+  // Output only. Assessment of this phone event for risk of SMS toll fraud.
+  SmsTollFraudVerdict sms_toll_fraud_verdict = 1
+      [(google.api.field_behavior) = OUTPUT_ONLY];
+}
+
 // Account defender risk assessment.
 message AccountDefenderAssessment {
   // Labels returned by account defender for this request.