On the French Paypal website, there is a solution named "Paypal Integral". I tought it was the same as PayPal direct. Seems I won't be able to use this solution.
Another though read the PaypalAPI doc's, there is some where a line that say something like
The Sandbox environment works in the same way as the live one; you can create a Pro account, but only from one of those three countries US, canada, and UK.
This error you are receiving, are you trying to bill in Rands, if this is the case you can if I recall only bill in a few currencies in the soap box and Live, I think they are AUD, USD, EUR, GBP, CAD, JPY, but in a live system you cna aso on bill is certain currencies, although it will bill your CC in the local currency if you choose.. https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_nvp_currency_codes