I want to validate with my credit card but it doesn't work.

If the validator refuses your transaction, this can be related to several reasons:

• Your bank card usage limit has been reached

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• Your card is expired or faulty

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• Your card must be presented alone on the validator (no overlapping cards)
• Your card is not compatible with the system (e.g. American Express - see question "what payment cards are not compatible with the service?")