FAQ Q101: What are the transaction identification numbers (ID, reference number, hash)?

Each transaction has 3 different identifiers / identification numbers: Usually each successful transaction will have 3 unique identifiers: transaction ID, reference number and hash. However, if the customer sends an insufficient amount, Bitvolo will ask them for a second payment. Such payment will have the same reference number but different transaction ID and hash (Bitvolo will correctly group and interpret such partial payments).
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