APP Application ID

appid

String(32)

Yes

This ID is issued after merchants have register their APP on WeChat open platform. It is the sub appid when calling the unified order API.
Example：wx8888888888888888

Merchant ID

partnerid

String(32)

Yes

Specifies merchant ID assigned by WeChat Payment. It is the sub mch_id when calling the unified order API.
Example：1900000109

Prepaid Trading ID

prepayid

String(32)

Yes

Specifies the parameter value (prepay_id) returned by the Unified Order API.
Example：WX1217752501201407033233368018

Order Extension String

package

String(128)

Yes

Specify as the static value “Sign=WXPay”
Example：Sign=WXPay

Random String

noncestr

String(32)

Yes

32 characters or fewer. For more information, see Random String Algorithm.
Example：5K8264ILTKCH16CQ2502SI8ZNMTM67VS

Time stamp

timestamp

String(10)

Yes

Specifies the current time. For more information, see Timestamp in Parameter Specifications.
Example：1414561699

Signature

sign

String(64)

Yes

Specifies a signature. For more information, see Signature Algorithm.
Note:Institution’s API key must be used for generating signature.
Example：C380BEC2BFD727A4B6845133519F3AD6

0

Payment successful

Show the payment successful page

-1

Payment error

Possible reasons: sign error, unregistered appid, incorrect project appid, registered appid not match to the set one, etc.

-2

Payment cancelled

No need to settle. User gives up the payment, etc.