Ok. Now I have filled out this form (I had doubts about filling out my card details).
At the moment of card verification, one dollar was debited from the card.
Just once again I would like to clarify: no funds will be debited from the card without my approval?
Hi Maxim! I'll need to get back to you on this and chat with the AWS team for confirmation that no funds will be debited. Per the rules, "AWS Credits can only be applied to AWS services. Additional charges incurred by the Maker for the use of AWS Data Exchange or AWS Marketplace products are the responsibility of the Maker. Makers are encouraged to monitor their usage of free trials as to not incur additional charges."
Therefore, I believe as long as you use the AWS promo code for AWS services then you shouldn't be charged (provided you're using it within the terms and conditions of AWS services).