# Scan Code Payment

# (1) Payment callback interface

After calling the WeChat charging interface, the business party receives the charging result notification.

# 1、 Request parameters

Parameter Name	type	Required	Remarks
appid	string	And	Mini Programs
appidmch_id	string	And	Payment Merchant Number
nuncio_st	string	And	Random string
encrypted_data	string	And	Using AESCBCPKCS7PADDING
iv	string	And	IV for decryption
sign	string	And	1Signature of field 5

The decrypted parameters are as follows:

Parameter Name	type	Required	Remarks
openid	string	And	User openid under applid
bank_type	string	And	Payment type
total_fee	int	And	Total payments in points
trade_state	string	And	Payment status: SUCCESS/FAIL
trade_msg	string	N	Return if payment fails
transaction_id	string	And	WeChat Payment Voucher
out_trade_No	string	And	Bus Code Business Order Number
attach	string	N	The cost of the API input, the original back
time_end	string	And	Payment completion time, in the format yyyy MMddHHmmss, such as December 25, 2009 9: 10: 10 seconds represented as 20091225091010
qrcode	string	And	two-dimensional barcode

# 2、 Return parameters

Parameter Name	type	Required	Remarks
Errcode	int	And	0 for success
errmsg	string	N	Error message
nuncio_st	string	And	Unaltered bring back

# 3、 sample code

{"appid":"test","mch_id":"123456","nonce_str":"abcdefg","encrypted_data":"jfiwajeofjiefef","iv":"afweifwefe"}

Post-decryption data:

{"openid":"fafwefawef","bank_type":"CFT","total_fee":100,"trade_state":"SUCCESS",...}

# WeChat Charge Interface (WeChat API Interface)

The utility model is used for the receiving business party to conduct secret deduction for the user according to the information obtained by the scan code interface.

# 1, request parameters

Parameter Name	type	Required	Remarks
qrcode	string	And	Bus code data, need base64
total_fee	int	And	Total payment, divided into units (after discount)
original_fee	int	And	Total amount paid, divided into units (before discount)
machine_ip	string	N	Scan code access IP
machine_latitude	float	N	Scanners GPS latitude
machine_longitude	float	N	Scanner GPS longitude
body	string	And	Bus withholding/Subway deduction
start_time	string	And	to get on or into/Travel time, such as 20091225091010
end_time	string	N	Get off time, format Ditto, suitable for the scene of the second brush code
line_name	string	And	Bus route
trade_scene	string	And	METRO/BUS
start_qrcode	string	N	When the code is brushed twice, the two-dimensional code used for the first time is passed in.
out_order_No	string	N	Business side custom order number, need to ensure unique
attach	string	N	Business-side custom data, and the statements and query interfaces return as is

# 2、 Return parameters

Parameter Name	type	Required	Remarks
Errcode	int	32Y	Return code
errmsg	string	N	Return Information

# 3、 sample code

Participation:

{"qrcode":"afefawefwef",....}

return

{"errcode":0,....}