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UnionPay logo

Merchant & POS

What Is UnionPay?

UnionPay International (UPI) is a China UnionPay subsidiary founded in November 2012. Together with more than 1,000 institutions worldwide, UPI provides international card acceptance in 160 countries and card issuance in more than 40 countries and regions.

Diagram of a partial authorization where an issuer approves only part of the requested amount

Merchant & POS

What Are the Partial Authorization Requirements for an Acquirer Bank?

Partial authorization lets an issuer approve part of the requested amount when the card lacks the full balance, with the rest paid another way. This post covers the technical, receipt, clearing, reconciliation, merchant and certification requirements for acquirers.

Contactless card payment at an overseas POS terminal that prompts for a PIN after a limit is exceeded

Payment Systems

Visa Overseas Contactless Transactions – After Code 70 (Part 2)

After switching to response code 70 for contactless limit-exceeded cases, we found that some overseas POS devices and acquirers did not handle it as expected. This post covers why the problem lies in the ecosystem and how to address it.

Illustration of customer-based contactless card limit management

Payment Systems

Can a Card's Contactless Limit Be Managed on a Per-Customer Basis?

Contactless payment has greatly improved the user experience, yet its fixed transaction limit is a common complaint. Can this limit be managed dynamically per customer? This post covers the current situation, technical and regulatory requirements and the outlook.

Illustration showing how an Application Identifier (AID) is used in a chip card transaction

EMV

What is an Application Identifier (AID)?

The AID tells the terminal which applications are present on a chip during a POS or ATM transaction. What does the AID do? It lets the terminal determine whether it supports an application on the chip. In Tag 9F06, it is 5-16 digits long.

Example of a combo card showing credit card information on the front and debit card information on the back

Credit Card

What is a combo card?

A combo card is a next-generation card that combines both a credit card and a debit card on a single card. Although designs vary visually, the front typically carries the credit card information and the back the debit card information.