| 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 |
