I need some help understanding a finer point of BIP21 URIs. Is there a required order for the parameters? I'm not very experienced with the concept of ABNF grammar, so I'm having trouble understanding.
For example, I know this is valid.
bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?amount=20.3&label=Luke-Jr
And I know this valid:
bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?amount=20.3&label=Luke-Jr&optionalparam=blahblahblah
But is this valid?
bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?optionalparam=blahblahblah&amount=20.3&label=Luke-Jr
Very specifically, must the order of parameters always be amount, label, message, and then optional params? Or is it OK to include optional params before the amount?
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