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im not sure who the payment provider is to be honest, I was just saying I bank with ChaseUK and they are the ones who have been helping me with merchant info and websites etc.
What I would do is just send them the payment details for this transaction, first six and last four of your card but also ask them to run your card details through their full payment system to find any other transactions, likely other merchants would have used them you might not know about yet
WinterMDSE is on my bank statement as card transaction. This links to Wintermads.com which is an NFT website. I contacted them and seem to have now processed a refund for me for £570.84