PENALTY UNDER SECTION 127 - Goods and Services Tax - GST

Plz peruse the following: Power to impose penalty in certain cases. 127. Where the proper officer is of the view that a person is liable to a penalty and the same is not covered under any proceedings under section 62 or section 63 or section 64 or section 73 or section 74 1 [ or section 74A ] or section 129 or section 130 , he may issue an order levying such penalty after giving a reasonable opportunity of being heard to such person. Query: What is amount of penalty leviable under Section 127 ? And what are the specific certain cases to invoke this section? Plz elaborate.