(a) The application must identify the goods and/or services in connection with which the mark is being used. A single class application may state that the mark is in use with any number of goods and/or services contained within one class. If the goods and/or services identified on the application fall within two or more classes, the application must comply with §93.32 of this title (relating to Supplemental Application Requirements for Applicants Seeking to Register a Mark in Two or More Classes).(b) Classification is the basis for determining the fees that must be paid. If the application sets forth goods and/or services in more than one class and submits insufficient fees to cover all the classes, the applicant must either amend the application to restrict the goods and/or services to the number of classes for which the fee has been paid, or submit additional payment to cover each class set forth in the identification of goods and/or services.