You should run lnbits yourself if you want to control the client extension. The Nostrclient extension can only be managed by the admin of the server as they can decide what relays the extension should connect to. Your shop seems to work fine for me
After writing to you I tried the Nostrmarket again and even without the Nostrclient extension it seems to work:
https://legend.lnbits.com/nostrmarket/market?merchant_pubkey=a76a3d01065e91710fd5fce44729280466ea03859611129e19ce34a62e538287&stall_id=TfK88hr4UAQdCytUwXd8jN
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Nostrclient is running on the demo serverif you are using that to manage your shop.
Can I continue to use it? 🙏 I like it a lot