There are 4 steps to open an Ads account on the No. 1 mobile application in China:

Have an official WeChat account (and contrary to popular belief, foreign companies can have an official WeChat account! I’m French, and I have one)
Gather these elements: – company name
– company registration number

– identification number of the administrator’s identity card, passport or driving license

From there, you should have a user number called 服务 号 in Chinese
Then

Opening the WeChat Ads account next costs 99 dollars (so provide a means of payment)
Remember to have your last three months of mobile and landline bills (requested as proof)
You must wait 2 to 3 days for validation of the account by Tencent (group of which WeChat is a part)
Identity card number, mobile and fixed lines, invoices, company registration, etc. that’s a lot of administrative documents to provide, but it is necessary if we want to get to the end of the process.

Because Chinese companies use to make money from oversea Customers

Why the hell would I do that? Is Wechat so important for SEO or for attracking new clients to a business in China?