- convert accented chars to ascii chars (via the unidecode lib)
- use "PrvtId" instead of "OrgId" in the XML
Use the sequence of payment.order as the "Message identification" of the XML file (advantages : it is unique, users can easily customize the sequence and users can easily find the payment corresponding to the "Message Identification" in OpenERP). It is also used as the Payment Identification, combined with the sequence type.
Use the sequence of payment.line in the "EndtoEnd Identification" field.
Reduce flake8 warnings.