charge braintree customer tool

src/Admin/Models/ChargeBraintreeModel.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Bit.Admin.Models
+{
+    public class ChargeBraintreeModel : IValidatableObject
+    {
+        [Required]
+        [Display(Name = "Braintree Customer Id")]
+        public string Id { get; set; }
+        [Required]
+        [Display(Name = "Amount")]
+        public decimal? Amount { get; set; }
+        public string TransactionId { get; set; }
+        public string PayPalTransactionId { get; set; }
+
+        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+        {
+            if(Id != null)
+            {
+                if(Id.Length != 36 || (Id[0] != 'o' && Id[0] != 'u') ||
+                    !Guid.TryParse(Id.Substring(1, 32), out var guid))
+                {
+                    yield return new ValidationResult("Customer Id is not a valid format.");
+                }
+            }
+        }
+    }
+}