Since January, BitPay, F4F's bitcoin payment processor, uses a controversial different address format (BIP70) that is only supported by a small handful of bitcoin wallets thus making it now impossible for many users, including me, to use that form of payment.
I humbly suggest you to replace BitPay or add a different bitcoin payment processor that use the widely adopted BIP21 address format. And also, making bitcoin payments possible with the special limited time offers 15%-20%-25% rebates would definitely help at increasing its use here.
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