Function check_transfer_hook_program 

pub fn check_transfer_hook_program(
    mint_data: &[u8],
    expected_program_id: &[u8; 32],
) -> Result<(), ProgramError>

Assert that the mint has a transfer-hook extension and that it invokes the expected program. Pairs with read_transfer_hook when the program’s business logic depends on a specific hook binding.

Returns Err(InvalidAccountData) if the extension is missing, malformed, or binds a different program than expected_program_id.