Here are the rules you need to follow to create a UPI number: 

1. The number should not start with a zero

2. It should not be created with the same digits; e.g., 99999999

3. It should not end with the same three digits

4. It must be of 8 or 9 digits

5. The digits should not be in ascending or descending order; e.g., 12345678, 987654321.