Created cancelSSLOrder (markdown)

cancelSSLOrder.md

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+URL: /orders/cancel_ssl_order/<br/>
+Request type: POST
+
+### Overview
+Use that option to request cancellation/refund of any order. Please note, it takes from 2-48 hours to review cancellation request. 
+
+### Request parameters
+* order_id - ID of the order to be canceled
+* reason – Cancellation reason
+
+### Response
+If no errors in request following parameters will be returned:
+
+* order_id - unique order ID