Contact
One email address for everything. No switchboard, no bot: we read and reply ourselves.
So the first reply is a useful one, tell us what happened and where: which Kuak Studio screen, or which extension and which version (it’s at the bottom of its panel). If it’s about a payment or a plan, add the email on your account.
Switching plan, cancelling or finding a receipt doesn’t need an email: it’s all in your Kuak Studio account, under “Manage subscription”.