I paid for a new mock using a BTC-processor that handles the bitcoin payment (with the use of a unique address).
Later I got a message from the vendor saying that the transaction was "cancelled", later he showed me a picture of his admin-dashboard where is showed that "status: failure", but the bitcoins are already over my side probably this was caused because I sent them less that the actual price stated(really minor). secondly I assume the bitcoins are now on his wallet, but he declines the bitcoins are on his wallet. now the question, who is responsible, I, the bitcoin gateway, or the vendor, and has the vendor to ship the item?
Here is the actual payment: https://www.blockchain.com/btc/address/16q9osWoKYffbY8iwJrr7DJg48sJWc4pGM