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