Where the use of a cash register is mandatory/optional

Companies/organizations may be required to use cash registers in their economic operations. Cash registers are to be installed in places where persons pay for the goods or services sold to them in cash and/or non-cash using a payment instrument, or where persons are paid in cash for the goods purchased from them.
The use of cash registers is not required where payments are made at residential, business or other places of delivery of goods/services designated by the customer, or under the provision of outdoor services, or in other specific cases.
For more detailed information, please see here (only in Lithuanian).