A client has upgraded to a higher package. However, only admin can approve the upgrade.

Transaction Details;
------------------------------------
Client: {user_full_name} {user_company_name}
------------------------------------
Old Service: {product_old_name} - {product_old_amount}
------------------------------------
New Service: {product_new_name} - {product_new_amount}
------------------------------------
Difference Fee: {difference_fee}