With Boei, you can create a WeChat button widget for your website within minutes. It is super simple!
This is how it will look like:

How to get there: Go to Setup → Widget in the top menu → click your widget → click Add Channel and select WeChat.
See Installation Guides.
Scanning someone's QR code is the fastest way to add them as a contact on WeChat.
To show your own QR code: From the Me tab, tap your avatar, then My QR Code.

Note that a group QR Code is valid for 7 days once created. Personal ones are valid indefinitely.
Create a new channel in Boei for WeChat. Here you can upload the QR code that you got from WeChat.
This is how it will look like:

When people click the channel, the page will be loaded in a new window.
You can hide this channel when you are out of office. This helps to reduce messages when you are not available. Learn more about business hours.