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Payment window includes $ in front of the amount.
Example here: http://d.pr/i/Wtvm
That's default for every currency, the currency abbreviation will be appended before the dollar sign.
I guess I'll remove the dollar sign for GBP for the next update if that looks wrong.
Is it possible to set the currency symbol anywhere? If not I'd remove it as GBP is quite clear.
No there's no way to set the currency symbol. If you want to remove it, go to line 237 to 239 in send-to.php and remove the dollar sign.