You need to find and buy Google Play developer accounts that are more than 6 months old.
What you need in the end from you:
1) Developer account with 1+ application on it;
2) Application age from 6 months;
3) Application project + key + password.
The number of installations in the application and the category are not important (any category - games, calculators, etc., anything), it can be apps without installations or with a minimum number.