If you don't have an account with Stripe yet, don't worry, you can create it right in the app.
To do it:
Open Settings.
Tap the Accepting Payments button.
Switch on Accept Card Payments by dragging it to the right.
Tap Link Your Bank Account.
Enter your email and password to associate with the account.
Enter your phone number to receive a verification code.
After that, you'll need to fill out the necessary information to create your account.
Stripe requires you to enter your personal information. It is necessary to ensure the account belongs to you and no one else can use it.