diff --git a/pr/webhook/pull_request.go b/pr/webhook/pull_request.go
new file mode 100644
index 0000000..fbca80b
--- /dev/null
+++ b/pr/webhook/pull_request.go
@@ -0,0 +1,6 @@
+package webhook
+
+func handlePullRequest(body []byte) {
+	// Use |= for openmaintainer/nomaintainer (init 1) flag, nomaintainer take precedence
+	// Loop over ports and aggregate related maintainers
+}
diff --git a/pr/webhook/server.go b/pr/webhook/server.go
index 9c5809a..773645a 100644
--- a/pr/webhook/server.go
+++ b/pr/webhook/server.go
@@ -48,6 +48,14 @@ func (receiver *Receiver) Start() {
 			return
 		}
 
+		switch r.Header.Get("X-GitHub-Event") {
+		case "":
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		case "pull_request":
+			go handlePullRequest(body)
+		}
+
 		w.WriteHeader(http.StatusNoContent)
 	})