# 3.1 OPT Checkout Features ### Cash Payments revver OPT is built in with a bank note acceptor and supports fuelling using cash as payment method. When a customer fuels less that the cash payment, the revver OPT supports printing of a dynamic overpayment voucher that can be redeemed in the station. #### Vouchers These vouchers generated by the OPT can later be used for filling by the customers. ### Cards #### Bank Cards The card entry includes tap, chip entry, swipe. These include VISA, Mastercard, Amex, Postfinance etc. #### Fuel Cards Fuel cards can be accepted by scan, magstripe entry based on terminal support. Currently this includes SOCAR card, Tamoil card, DKV, UTA etc. ### Loyalty Scanning of loyalty cards, awardingof points is supported by the Revver OPT. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://features.revver.tech/features/3.-opt-features/3.1-opt-checkout-features.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.