Custom payment gateway language is always "en"

I am building a multilingual shop with languages “de” and “en”. The languages work perfectly fine. But for some reason the custom payment methods webhook always returns “en” as language, regardless of which language the customer has selected.

I am having this problem as well. Can anyone follow up on this matter?

I would like to follow up on this matter. I have set Snipcart language to “vi”, the cart displays the correct language but when the user is redirected to the custom payment method, the language is set to “en” in the body.