feat(api): add ledger_transaction_id field to reversal (#383)

src/resources/payment-orders/reversals.ts

@@ -72,6 +72,11 @@ export interface Reversal {
 
   created_at: string;
 
+  /**
+   * The ID of the ledger transaction linked to the reversal.
+   */
+  ledger_transaction_id: string | null;
+
   /**
    * This field will be true if this object exists in the live environment or false
    * if it exists in the test environment.