Your users are charged the price you set for a Charge plus any applicable VAT for the country they are in, along with a processing fee which is added to their invoice in any month they use a paid charge from your API.
If a British user makes 1000 requests to a charge of your API priced at £0.0015 , they will be charged £0.0015 * 1000 = £0.15 + 20% VAT, so in total that month they will pay £0.018 + £1 (processing fee).
You can receive payouts when your pending balance is over the minimum payout amount (shown below).
To receive a payout you must setup your payout account in the API Manager billing section. Until your account is setup and has the required information you cannot receive payouts. This process usually only takes a few minutes.
Payouts are paid out every month on the 20th of the month. Note that transactions up to 7 days before this date may be withheld from the payout for security, to allow time to resolve any disputes.
Your pending balance is the total amount of unpaid PayPI subscriptions. When a subscriber pays for their usage for that month, this amount will be made available to you.