What is the amendment fee for a loan?

Excuse me, could you please clarify what the amendment fee for a loan entails? I'm trying to understand if there's a specific cost associated with making changes to the terms of my loan agreement, such as extending the repayment period or adjusting the interest rate. Is this fee standard across all loan products, or does it vary depending on the lender and the type of loan I'm considering? Additionally, could you provide an estimate or range of what this fee might typically be, and how it would be calculated? I'm eager to have a better grasp of the potential financial implications before making any decisions.