Haven't heard of them at all, that's what's wrong.
They may be great services, of course, being that I, a single consumer, am not a barometer for the success of a payment platform. But whoever they are, they're not being used by major retailers, distributors or manufacturers that I shop with both personally and professionally.
IIRC Ebay uses Adyen. I think Paypal uses Trustly in some significant markets.
I don't know why they didn't show up early in your research, as they are among the most well known and easy to find. Ingrid is lesser known and mostly active in e-commerce in the european markets.
They may be great services, of course, being that I, a single consumer, am not a barometer for the success of a payment platform. But whoever they are, they're not being used by major retailers, distributors or manufacturers that I shop with both personally and professionally.