diff --git a/src/main/Apis/Transactions/ITransactionsApi.cs b/src/main/Apis/Transactions/ITransactionsApi.cs
index 04a6364..121315c 100644
--- a/src/main/Apis/Transactions/ITransactionsApi.cs
+++ b/src/main/Apis/Transactions/ITransactionsApi.cs
@@ -4,7 +4,7 @@ namespace PayStack.Net
 {
     public interface ITransactionsApi
     {
-        TransactionInitializeResponse Initialize(string email, int amountInKobo, string reference = null, bool makeReferenceUnique = false);
+        TransactionInitializeResponse Initialize(string email, int amountInKobo, string reference = null, bool makeReferenceUnique = false, string currency = "NGN");
         TransactionInitializeResponse Initialize(TransactionInitializeRequest request, bool makeReferenceUnique = false);
         TransactionVerifyResponse Verify(string reference);
         TransactionListResponse List(TransactionListRequest request = null);
diff --git a/src/main/Apis/Transactions/Initialize.cs b/src/main/Apis/Transactions/Initialize.cs
index 60d0ab2..983cac5 100644
--- a/src/main/Apis/Transactions/Initialize.cs
+++ b/src/main/Apis/Transactions/Initialize.cs
@@ -22,6 +22,9 @@ public class TransactionInitializeRequest : RequestMetadataExtender
         [JsonProperty("transaction_charge")]
         public int TransactionCharge { get; set; }
 
+        [JsonProperty("currency")]
+        public string Currency { get; set; } = "NGN";
+
         public string Bearer { get; set; }
     }
 
diff --git a/src/main/Apis/Transactions/TransactionsApi.cs b/src/main/Apis/Transactions/TransactionsApi.cs
index 79e91d9..469ec94 100644
--- a/src/main/Apis/Transactions/TransactionsApi.cs
+++ b/src/main/Apis/Transactions/TransactionsApi.cs
@@ -11,8 +11,8 @@ internal TransactionsApi(PayStackApi api)
             _api = api;
         }
 
-        public TransactionInitializeResponse Initialize(string email, int amount, string reference = null, bool makeReferenceUnique = false)
-            => Initialize(new TransactionInitializeRequest { Reference = reference, Email = email, AmountInKobo = amount }, makeReferenceUnique);
+        public TransactionInitializeResponse Initialize(string email, int amount, string reference = null, bool makeReferenceUnique = false, string currency = "NGN")
+            => Initialize(new TransactionInitializeRequest { Reference = reference, Email = email, AmountInKobo = amount, Currency = currency }, makeReferenceUnique);
 
         public TransactionInitializeResponse Initialize(TransactionInitializeRequest request, bool makeReferenceUnique = false)
         {