Your Stripe account automatically converts all payments you receive to your Stripe account currency based on the country where your Stripe account is registered in. For example, if you have a Stripe account registered in Germany, you will receive Euros. If you're in Hong Kong, HKD, and so on.

Accepting WeChat Pay payments means you need to define your Stripe account currency in the payment form shortcode by using the following shortcode attribute: default_currency="USD"