I have done several shops for both companies and have never spoken with/corresponded with people at either, but Jancyn has very easy forms.
Info good on both, BMA payment shows up in paypal as something like dolan group.
Both pay relatively quickly to quickly in my experience. I have found the instructions straightforward from both.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton