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"TLV"

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Diagram illustrating the TLV (Tag-Length-Value) data structure

Online & Authorization

What is TLV (Tag-Length-Value)?

TLV is a data storage method used to speed up the parsing of data. For example, reading data from a card's chip at a POS and carrying it through authorization uses the TLV structure.

Diagram illustrating the EMV Tag-Length-Value (TLV) data structure used in card transactions

Online & Authorization

What are EMV Tags?

In EMV, data is stored in Tag-Length-Value (TLV) format, and it is carried between the card, the POS terminal, and the authorization system in this same format. This post lists every EMV Tag, its type, and its description.

Diagram of the EMV application selection flow between the terminal and the card

Merchant & POS

EMV Chip Transaction Processing - What Is Application Selection?

In EMV transactions, Application Selection is the process of choosing among the applications supported by both the card and the terminal. It is the first stage of authorization, so it is very important. This post covers the PSE and List of AIDs methods.

EMVCo QR code payment standard illustration

Merchant & POS

What Is the EMVCo QR Standard?

QR code payments are growing, but without a common QR structure each code only works locally. EMVCo published a standard QR data structure so all payment schemes can share one QR code format at merchants.