Earlier quoted context omitted.
I've worked with Bitpay while making https://www.incoin.io/ and their developer docs are average to good. It wasn't horrible, the documentation was good enough and Bitpay offered to help (and were super helpful when we asked any questions). In fact, other than having to implement BitAuth ourselves it was pretty painless. Regarding your AngelHack prize... the same thing happened to me. I'd be more skeptical of AngelHa…
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A potential work around is to just BitAuth with a HD wallet? Thereby negating any address-reuse issues.
https://github.com/bitcoin/bips/blob/master/bip-0032.mediawi...