Given how hard it was for me to do non cash commerce without a Chinese ID card, it's no surprise that you don't use those features. Do you use the app in English? Maybe the English version doesn't even have these features.
But as of today, the English version has all of these features mentioned. I have used the Taxi feature (滴滴打车）4 times today.
I also pay all my utilities and internet bill within WeChat.
When I am outside and people want to buy my products, they can scan my WeChat QR code in an instant.
Companies that are not registered in China can open one no problem, but only people using the English version will be able to see/access your "Public Account".
If you want to sell to Chinese people, you will need to register a Company in China. Of course there are ways around this, there always is in China.
Really depends on your strategy and what you are selling, some foreigners selling products here, just create a separate regular account to keep their buyers/followers updated on latest news/products, and talk directly on wechat to accept payment.
Any questions bartnanka at gmail