My Shopify store is suddenly unavailable after I tried to change my debit card because I lost the previous one, please I think that I've done nothing wrong from my side (My products respects "Shopify Acceptable use Policy")
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This is an accepted solution.
What's your URL or store address?
If you changed your debit card, your membership might have been temporary removed until the new card was authorised by Shopify.
I'm just guessing here, your best bet is to contact Shopify directly to make sure your new debit card was accepted by Shopify for the membership.