QUESTION 7:
Can an e-store make transactions in any currency?
Should total amount to charge (CHARGE variable in Merchant's form) be accompanied by a currency abbreviation?

ANSWER:
Any currency can be used (complying with VISA specifications)

Merchants can choose what currency to use. VISA specifications include nearly all currencies in the world. Merchants should declare promptly to Egnatia Bank the currency they want to use. If multiple currencies are to be used, multiple contracts should be made with Egnatia Bank. Each e-store corresponds to a POS (Point Of Sales). After calculating transaction total amount, your Application should provide this number as an integer. This mechanism is specified by VISA.
Caution: Value 12.345,34 GRD for CHARGE is wrong. Correct value should be 12345, without ,. and currency abbreviation.