docs: added user guide for manage payment (#2194)

docs/content/user-guide/orders/payments.md

@@ -2,10 +2,47 @@
 sidebar_position: 3
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-# Manage Payments
+# Manage Order's Payments
 
-:::note
+In this document, you’ll learn how to manage an order’s payment, including capturing and refunding the payment.
 
-This guide is coming soon.
+## Overview
+
+When a customer places an order, using the payment provider they choose during checkout, they authorize the payment.
+
+The payment isn’t automatically captured. You must capture it manually from the Medusa admin.
+
+## Capture Payment
+
+:::info
+
+Payment can only be captured once.
 
 :::
+
+To capture an order’s payment:
+
+1. Open the order details page.
+2. Scroll to the Payment section.
+3. Click on the Capture Payment button.
+
+## Refund Payment
+
+:::caution
+
+Payment can only be refunded after it has been captured. Refunding payments can’t be undone.
+
+:::
+
+To refund an order’s payment:
+
+1. Open the order details page.
+2. Scroll to the Payment section.
+3. Click on the Refund button.
+4. In the new window that opens:
+    - Enter the Refund amount. It must be less than the Total Paid amount specified in the Payment section.
+    - Choose a reason for the refund and optionally provide a note.
+    - If you don’t want the customer to receive an email that the refund has been made, uncheck the “Send notifications” checkbox.
+5. Once you’re done, click on the Complete button.
+
+You can check refund details in the Payment, Summary, and Timeline sections.