Nail-polish brand with a color called Madam President

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OPI.

Last seen on: The Atlantic Sunday, March 26, 2023 Crossword Answers

Random information on the term “OPI”:

The Open Payment Initiative, or O.P.I. for short, was launched to standardize the application interface between the EPOS application and any cashless payments solution installed on the EFT/PoS terminal. The specification for this interface focused mainly on international and cross-industry aspects. Today, the O.P.I. interface is already a de facto European standard, which is spreading from Germany to retailing projects throughout Europe.

The specifications, which were first published in 2003, and reference installations are based on the POS EPS specifications from IFSF (International Forecourt Standards Forum), which were developed for the service station industry and to which retail features have been added. The universal O.P.I. interface has made it possible to integrate varying EFT/PoS solutions in European POS projects for the first time.

The O.P.I. interface implementation does not depend on a specific operating system.It is an XML-based interface. Communication takes place via TCP/IP. The XML messages are exchanged over two sockets that are referred to as channels (channel 0 and channel 1). The original OPI/IFSF specification defines three message pairs:

OPI on Wikipedia