I used GL payments for about 5 years. The first few years were ok, but I had to remind them about paying me. Thery still owe me about £80 from 6 months ago, but despite enquiring, there is no response.
My guess is they have totally gone under. I see they have also removed their telephone number from the site, which basically says it all. It's a disgrace if they are still taking on clients, when they are to all intents finished.