Interface Description：
- Cancel Contract Order
Request URL：
https://apiv2.bitz.com/Contract/cancelContractTrade
Request Mode：
POST
Parameter：
| Parameter | Required | Tpye | Commet |
|---|---|---|---|
| apiKey | Yes | string | Application apiKey |
| timeStamp | Yes | string | Current timestamp |
| nonce | Yes | string | Random 6-character string |
| sign | Yes | string | Request signature |
| entrustSheetId | Yes | int | Contract ID In the return value orderId |
How to sign for required parameter：
All parameter submitted by users except sign requires signature.
Firstly, sort signature strings in alphabetical order based on parameters (compare the first letter of all parameter, if they differ, then the string whose first letter comes earlier in the alphabet comes before the other string. If the first letters are the same, then the second letters are compared, and so on).
For example：Sign for the following parameter
apiKey=376892265asdad5d12726d8bbfbd8912b3&timeStamp=1510235730&nonce=309127&entrustSheetId=123456 and add application secretKey (only needs value, parameter and ‘&” is not required.)
For example:
secretKey=aQmE8U7bxj16KdJcSd3yX8F8Sakd8aO6LopnHXh27d4kWyb28PxcaTvGrajLDvAw
Signature string after splicing: apiKey=376892265asdad5d12726d8bbfbd8912b3&timeStamp=1510235730&nonce=309127&entrustSheetId=123456aQmE8U7bxj16KdJcSd3yX8F8Sakd8aO6LopnHXh27d4kWyb28PxcaTvGrajLDvAw
Note，"sign" is a required parameter.
Lastly，use md5 32bit algorithm to apply signature algorithm to the parameter, and then generate final signature string (the string assigns value to parameter ‘sign’).
Example of Return Result：
{
"status":200,
"msg":"",
"data":{
},
"time":1533035297,
"microtime":"0.41892000 1533035297",
"source":"api"
}