The WeChat Unique Item Code feature gives each product a unique QR code that is integrated with WeChat's native capabilities. With this feature, brand owners can connect each product with consumers to provide product information and anti-counterfeit services, encouraging them to follow Official Accounts and send red packets for accurate target marketing and better user and data management.
How it works
WeChat QR codes consist of a fixed prefix, a translated and compressed product ID, and a custom parameter. The fixed prefix is a 16-character string for WeChat identification. The product ID is a unique 12-character string for product identification. The custom parameter is entered by a merchant and passed through as the primary key in the entire process: QR code is generated > user scans the QR code > user opens product page > user visits page set by the merchant. Merchants can receive events pushed by WeChat and check the ticket to find the relationship between a QR code and a user.
Backend interaction mode
QR code description
| Field | Description
Step1: Get merchant information
Step 2: Create product
Step 3: Publish product
Step 4: Get product QR code
Step 5: Print QR code
Recommended QR code version
QR Code rules
To better print the QR code, see rules at http://www.qrcode.com/zh/about/version.html.
The length of extinfo, QR code version, correction level, and QR code size may affect the QR code printing effect. For QR codes with the same content, those with a higher correction level have a higher version. For QR codes of the same version, those with a higher correction level contain less content.
QR code Version L2 and L3 are recommended on the WeChat platform. Version L4 can be used in extreme cases.
| QR Code Version | Number of Available Character Positions | Number of Occupied Positions
|Number of Remaining Positions||Matrix|
Note: A matrix of 25*25 means there are 25 data points per row and per column in a QR code.
Version image examples
Example 1: Different sizes of Version L2 QR code with extinfo parameter of no more than 4 characters and matrix of 25*25
The QR code content is http://p.url.cn/yA4AcHqlXqY/1234.
Example 2: Different sizes of Version L3 QR code with extinfo parameter of no more than 25 characters and matrix of 29*29
The QR code content is http://p.url.cn/yA4AcHqlXqY/0123456789012345678901234.
Example 3: Different sizes of Version L4 QR code with extinfo parameter of no more than 50 characters and matrix of 33*33
The QR code content is http://p.url.cn/yA4AcHqlXqY/01234567890123456789012345678901234567890123456789.