other wise Minimum wages for the respective state will be applicable
1 The minimum wages of the respective States will have to be followed if the Act is .applicable in each state.
2 I suggest, for the first time you find out which state gives the highest min wages and add to that likely changes in D.A. in a year, considering the trend of increase/decrease for past two years and pay uniformly to all employees pan India in that category.
3 Review every year , and revise the wages based on changes in the DA .
You need to pay salary as per respective states minimum wages. If your business falls under central category, then you need to pay central minimum wages. Every state periodically publish minimum wages in their gazette.
Also you need to maintain registers and records for every states.