push registration through relay apis

src/Core/Models/Api/Request/PushRegistrationRequestModel.cs

@@ -0,0 +1,19 @@
+using Bit.Core.Enums;
+using System.ComponentModel.DataAnnotations;
+
+namespace Bit.Core.Models.Api
+{
+    public class PushRegistrationRequestModel
+    {
+        [Required]
+        public string DeviceId { get; set; }
+        [Required]
+        public string PushToken { get; set; }
+        [Required]
+        public string UserId { get; set; }
+        [Required]
+        public DeviceType Type { get; set; }
+        [Required]
+        public string Identifier { get; set; }
+    }
+}