How do I prevent people from adding liquidity in a different pair?

Smart Contracts
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1

I use the Pancakeswap LP Pair address for (BNB/Token) in an if statement to check if the transfer is a buy/sell. But if someone provides liquidity using a different pair for the token, example USDT/Token, then the LP Pair address would change and will be excluded from the if statement.

Is there a way to either:

  • Prevent anyone else apart from the owner to create a new Liquidity Pair?
  • Prevent any liquidity pair except for BNB/Token to be created?
  • Check if an address is a Pancakeswap LP Pair address or not?
  • Find a way to automatically add the new pairs' created addresses into the if statement?

Any option that would solve the problem would be a huge help. Thanks!