Bad Plugin. Lost My Money!

The plugin author wants you make a prepayment to him in Bitcoins as a Fees. I did this before my sales were generated. I bought a bitcoin with a high price, now the price of bitcoin is declining, and I have not yet generated any major sales.
I.e. the author of the plugin keeps my bitcoins as a prepayment for fees, but the actual price in fiat for these my bitcoins is less if I will decide to transfer it back to US dollars.

Other bitcoin payment plugins on wordpress are free and do not require any prepayments like this plugin. I moved away from this plugin.