Hi Sheryl and Robin, 
Yes, as Robin mentioned, your mysterious payment is from us.
Ecom Access is our parent company.
We issued Jackpotjoy’s affiliate commissions for March as per norm since their affiliate program was still in our network.
We are still working together albeit as affiliate program software providers.
Hope this clears it all up.
It is our pleasure to send you money particularly when it is comes as a surprise. Mind you, you earned it.
All the best.
Kind regards,
Sarafina