# Error code description

Code	Description	Reason
0010	system error	system timeout or exception
0011	post method required	must use post method
0012	post data empty	post data can not be empty
0013	signature error	parameters sign not correct
0014	parameter error	parameter missing or not correct
0015	merchant not exist	can not find merchant id in system
0110	third party timeout	third party timeout
0111	third party exception	third party exception
0112	merchant order id not exist	merchant order id not exist
0113	order already paid	order already paid, don't repeat operation
0118	DB error	DB error