diff --git a/GoCardless/Resources/BillingRequest.cs b/GoCardless/Resources/BillingRequest.cs
index 2b3df9f..ce20669 100644
--- a/GoCardless/Resources/BillingRequest.cs
+++ b/GoCardless/Resources/BillingRequest.cs
@@ -438,7 +438,7 @@ public class BillingRequestInstalmentScheduleRequest
         /// information on how to specify instalments.
         /// </summary>
         [JsonProperty("instalments")]
-        public List<string> Instalments { get; set; }
+        public IDictionary<string, string> Instalments { get; set; }
 
         /// <summary>
         /// Resources linked to this BillingRequestInstalmentScheduleRequest.
diff --git a/GoCardless/Services/BillingRequestService.cs b/GoCardless/Services/BillingRequestService.cs
index 08a1561..4a61f3e 100644
--- a/GoCardless/Services/BillingRequestService.cs
+++ b/GoCardless/Services/BillingRequestService.cs
@@ -465,7 +465,7 @@ public enum BillingRequestCurrency
             /// more information on how to specify instalments.
                 /// </summary>
                 [JsonProperty("instalments")]
-                public string[] Instalments { get; set; }
+                public IDictionary<String, String> Instalments { get; set; }
                 
                 /// <summary>
                             /// Key-value store of custom data. Up to 3 keys are permitted, with
diff --git a/GoCardless/Services/InstalmentScheduleService.cs b/GoCardless/Services/InstalmentScheduleService.cs
index 1a6c0a0..ac0e5c0 100644
--- a/GoCardless/Services/InstalmentScheduleService.cs
+++ b/GoCardless/Services/InstalmentScheduleService.cs
@@ -315,7 +315,8 @@ public enum InstalmentScheduleCurrency
 
         /// <summary>
         /// An explicit array of instalment payments, each specifying at least
-        /// an `amount` and `charge_date`.
+        /// an `amount` and `charge_date`. See [create (with
+        /// dates)](#instalment-schedules-create-with-dates)
         /// </summary>
         [JsonProperty("instalments")]
         public InstalmentScheduleInstalments[] Instalments { get; set; }
@@ -523,6 +524,8 @@ public enum InstalmentScheduleCurrency
         /// of payment
         /// amounts to be collected, with a specified start date for the first
         /// payment.
+        /// See [create (with
+        /// schedule)](#instalment-schedules-create-with-schedule)
         /// 
         /// </summary>
         [JsonProperty("instalments")]
@@ -532,6 +535,8 @@ public enum InstalmentScheduleCurrency
         /// of payment
         /// amounts to be collected, with a specified start date for the first
         /// payment.
+        /// See [create (with
+        /// schedule)](#instalment-schedules-create-with-schedule)
         /// 
         /// </summary>
         public class InstalmentScheduleInstalments
diff --git a/GoCardless/Services/MandatePdfService.cs b/GoCardless/Services/MandatePdfService.cs
index a7d02b2..996674f 100644
--- a/GoCardless/Services/MandatePdfService.cs
+++ b/GoCardless/Services/MandatePdfService.cs
@@ -286,6 +286,13 @@ public enum MandatePdfAccountType
         public class MandatePdfLinks
         {
                 
+                /// <summary>
+                            /// ID of an existing [creditor](#core-endpoints-creditors). Only
+            /// required if your account manages multiple creditors.
+                /// </summary>
+                [JsonProperty("creditor")]
+                public string Creditor { get; set; }
+                
                 /// <summary>
                             /// ID of an existing [mandate](#core-endpoints-mandates) to build
             /// the PDF from. The customer's bank details will be censored in