How to test Mochicoins without approval?

[JoKa]

I created a shop for my game on Mochiads.

On their website they wrote that the shop runs in sandbox mode, but this didn't work for me. So I submitted my shop for approval, but had no chance to test any Mochicoins features. How do you handle this conflict?

[James]

You sign in with an @ before your email address to use your game in sandbox mode.

[JoKa]

That's what Mochi tells me when trying to access the shop, but it doesn't work. I tried @username and @emailaddress, but get a login error...