Refer Online check-in setup to get your Stripe publishable and restricted API keys
In the Service Provider section, press on the Provider Billing button on the left side, and then scroll down, and press Create New Provider Billing, to start the process
Press Create New, you will be taken to the provider billing form, select Stripe as your billing provider, and enter your publishable API key, then press Submit
On the next page, select the billing provider that you just create, then press Next, then press the Dropdown arrow, and then the +. Press Create New, and then enter your restricted API key.
Finally, press Next, and then you should be taken to your newly created billing profile, and new billing key.