IIRC a few years ago I saw some store asking for 6 or 8 digit BLIK codes, I guess the latter was how they were planning to expand from supporting just Poland to

IIRC a few years ago I saw some store asking for 6 or 8 digit BLIK codes, I guess the latter was how they were planning to expand from supporting just Poland to supporting whole EU. But that effort seems to have died out.