If you as a representative of your firm is managing the setup of the Apple App Store Account but you are not the legal binding authority of the club, then you have to involve a colleague who has the right authority.
In the process together with Loialcard contact details of that persons are entered into the dedicated form and Apple then sends an email with a link for that person to follow to give you the proper approval to continue the process.
Apart from answering the form linked from the email, Apple might want to talk to the person over the phone asking a few validating questions.
The email from Apple
The form to be reviewed
