The integrity statement is a clause included in all online exams to inform students about their responsibility and commitment to complete the exam without committing any type of fraud.

See an example below:

Please be aware that if you do not comply with these terms and conditions and/or there is a suspicion of fraud, sanctions may be imposed by the Examination Board which could even extend to permanent termination of your student registration (Rules and Guidelines Article 3.6).

If you wish to learn more about the Examination Regulations, you can read about it here.

If you decline the integrity statement, the exam cannot be assessed, because it could be that part of the exam is not your own work. So, the result is a blank. 

If you fail to endorse the statement, you will also receive a blank result. 

If, after the exam, you realize that you failed to endorse the statement and report it to the course instructor, you will be asked to agree to the statement on paper, sign it, photograph it or scan it and send it to the course instructor. Then it could still be possible that you get a grade for the exam.