Try to change the follows line in the btcz.php file, (line 178-189) and reload the plugin:
$fields = array(
'f' => "create",
'p_addr' => urlencode($MerchantAddress),
'p_pingback' => urlencode($PingbackUrl),
'p_invoicename' => urlencode($InvoiceID),
'p_email' => urlencode($MerchantEmail),
'p_secret' => urlencode($Secret),
'p_expire' => urlencode($Expire),
'p_currency_code' => urlencode($CurrencyCode),
'p_success_url' => urlencode($ReturnUrl),
'p_amount' => urlencode($Amount)
);
by
$fields = array(
'f' => "create",
'p_addr' => urlencode($MerchantAddress),
'p_pingback' => urlencode($PingbackUrl),
'p_invoicename' => urlencode($InvoiceID),
'p_email' => urlencode($MerchantEmail),
'p_secret' => urlencode($Secret),
'p_expire' => urlencode($Expire),
'p_success_url' => urlencode($ReturnUrl),
'p_amount_usd' => urlencode($Amount)
);
** Removed the line with “p_currency_code” and updated “p_amount” by “p_amount_usd”.
Should get this result (for $10)