diff --git a/internal/mobileapi/mobileapi.go b/internal/mobileapi/mobileapi.go
new file mode 100644
index 0000000..876b06d
--- /dev/null
+++ b/internal/mobileapi/mobileapi.go
@@ -0,0 +1,42 @@
+package mobileapi
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// DeviceRegistration represents a mobile device registering for push
+// notifications and API access.
+type DeviceRegistration struct {
+	DeviceID   string `json:"device_id"`
+	Platform   string `json:"platform"`
+	PushToken  string `json:"push_token"`
+	AppVersion string `json:"app_version"`
+}
+
+type registerResponse struct {
+	Status   string `json:"status"`
+	DeviceID string `json:"device_id"`
+}
+
+// RegisterDeviceHandler accepts a mobile device registration payload and
+// acknowledges it, enabling seamless mobile app integration.
+func RegisterDeviceHandler(w http.ResponseWriter, r *http.Request) {
+	var reg DeviceRegistration
+	if err := json.NewDecoder(r.Body).Decode(&reg); err != nil {
+		http.Error(w, "invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	if reg.DeviceID == "" || reg.Platform == "" {
+		http.Error(w, "device_id and platform are required", http.StatusBadRequest)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(registerResponse{
+		Status:   "registered",
+		DeviceID: reg.DeviceID,
+	})
+}