Missing documentation

[maxie112]

What are the following parameters:

variable_symbol: str = '',
constant_symbol: str = '',
specific_symbol: str = '',

What do they stand for?

[matusf]

Those are symbols used for domestic payments in SK/CZ. They are not mandatory. So if you don't know them, you probably do not need to set them. If you would like to read more, here is something about variable symbol, and if you know czech here is something about specific symbol and constant symbol.