Does one sin by selling a book via Amazon Kindle if the buyer pays with an interest-based credit card or another forbidden means, given that the seller does not know how the purchase process is carried out, and the book itself is not forbidden?
The question has been answered previously. There is no harm for the questioner in selling his books through the aforementioned website. He incurs no sin if the buyer uses an unlawful means without his knowledge.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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