amount, pcode, ref_number, extra_infos

[noem6942]

Proposals:

• type(amount) should be float not str
• rename pcode to postal_code as used in common
• rename ref_number to reference_number (as in SIX documentation)
• rename extra_infos to additional_information (as in SIX documentation)
• implement Billing Information (to my understanding it's approved by 1.1.2021)

[claudep]

Would you like to submit patches? In that case, please one change per commit (could be one or several pull requests). The last point probably deserves a separate issue.

[noem6942]

Point 1 to 4 is trivial to implement without any backwards compatibility - but do you really want this?

[claudep]

Sure, it looks like proper cleanup. It might be a bit less trivial if we want to keep compatibility with old names at entry points (script parameters and QRBill.__init__).

[bb1950328]

type(amount) should be float not str

this is a bad idea.