I have been a Trello standard user
I have been paying with my debit card.
I recently upgraded to Premium.
But the payment couldn't process again.
Trello is declining my card
But it is the same card I have been using for transaction.
You will need to talk to Atlassian billing support, contact them at https://trello.com/contact - use the last option on that page, the others bring you back here or to documentation.
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