Open_Payment_Initiative
The Open Payment Initiative, or O.P.I. for short, was launched to standardize the application interface between the electronic point of sale (EPOS) application and any cashless payments solution installed on the electronic funds transfer at point of sale (EFTPOS) payment terminal. The specification for this interface focused mainly on international and cross-industry aspects. By 2005 The O.P.I. interface had become a de facto European standard, which spread from Germany to retailing projects throughout Europe.
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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.