Swaps (swap points) are like interest rates generated by holding a currency pair. It generates profit or loss in a certain time frame while holding a position.
Swaps can be carried forward (rolled over). The amount of swap is depending on the interest rates of the countries involved in each currency pair and whether the position is short or long. The swap points are paid in the currency of the seller and received in the currency of the buyer in any currency pair.
Liberty Forex swaps are usually offered by your liquidity provider each time. Each currency pair has its own swap and is calculated in one standard size lot (100,000 basic units).