GST registration applications may receive notices to supply documents or appear; failure to respond can lead to rejection. Form GST REG-03 is a notice requiring applicants for GST registration, amendment, or cancellation to supply specified additional information, clarification, or documents identified by ARN and date, set a response deadline, and possibly attend a personal appearance before the proper officer. It warns that failure to respond by the stipulated date may lead to rejection for non-response, records the proper officer's signature, name, designation and jurisdiction, and notes that personal appearance is not applicable for new registration applications.