Added SettlementStatus convenience constants

Author: alexstewartja

src/BitPaySDK/Model/Settlement/Settlement.php

@@ -141,6 +141,7 @@ public function setPayoutInfo(PayoutInfo $payoutInfo): void
      * Gets Status of the settlement. Possible statuses are "new", "processing", "rejected" and "completed".
      *
      * @return string|null
+     * @see SettlementStatus
      */
     public function getStatus(): ?string
     {
@@ -151,6 +152,7 @@ public function getStatus(): ?string
      * Sets Status of the settlement. Possible statuses are "new", "processing", "rejected" and "completed".
      *
      * @param string $status
+     * @see SettlementStatus
      */
     public function setStatus(string $status): void
     {

src/BitPaySDK/Model/Settlement/SettlementStatus.php

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * Copyright (c) 2025 BitPay
+ **/
+
+/**
+ * @author BitPay Integrations <[email protected]>
+ * @license http://www.opensource.org/licenses/mit-license.php MIT
+ */
+
+namespace BitPaySDK\Model\Settlement;
+
+/**
+ * Status of the settlement.
+ * Possible statuses are "new", "processing", "rejected" and "completed".
+ *
+ * @package BitPaySDK\Model\Settlement
+ * @author BitPay Integrations <[email protected]>
+ * @license http://www.opensource.org/licenses/mit-license.php MIT
+ * @see https://developer.bitpay.com/reference/settlements Settlements
+ */
+interface SettlementStatus
+{
+    public const NEW = "new";
+    public const PROCESSING = "processing";
+    public const REJECTED = "rejected";
+    public const COMPLETED = "completed";
+}