When using Multi currency in blesta, clients can set their preferred exchange rate and the system will convert+pad it acording to the settings.

Example:
A Package/Service is 60 Euro per month. The client sets his currency to USD. Multi-Currency converts+pads the amount to 72 USD.

Then the invoice should have a line showing:
(Invoice Value: 60 Euro. Converted to 72 USD at the exchange rate of _______ on $Date.)

that would really simplify the whole multi-currency and bookkeeping process for some of us.

kind regards