added JSON.parse

packages/rocketchat-integrations/server/api/api.coffee

@@ -54,7 +54,7 @@ Api = new Restivus
 			payloadIsWrapped = @bodyParams?.payload? and payloadKeys.length == 1
 
 			if payloadIsWrapped and @request.headers['content-type'] is 'application/x-www-form-urlencoded'
-				@bodyParams = @bodyParams.payload
+				@bodyParams = JSON.parse @bodyParams.payload
 
 			@integration = RocketChat.models.Integrations.findOne
 				_id: @request.params.integrationId