The official currency is the Qatari Rial. You can exchange USD for Qatari Rial at the airport, or withdraw cash from numerous ATMs. There are plenty of banks in Doha with ATM use for tourists as well.
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Major credit cards are widely accepted in Qatar, and many ATM's accept cards issued by US financial institutions. Most hotels will exchange currency, or offer bills of smaller denominations appropriate for tipping and other incidentals. Smaller retailers in Doha's marketplaces (or souqs) may accept cash payments only.
Access is permitted for those flying first and business classes on Qatar Airways as well as OneWorld alliance members with the same class of ticket. Economy-class passengers flying with Qatar Airways can also purchase a pass for 450 QAR, which equates to about 120 USD.
Lounge access is complimentary only for the Primary and Supplementary Card members of the eligible Doha Bank Al Riyada VISA Infinite, Visa Signature, Visa Cashback, Visa Platinum and Doha Bank Lulu Platinum MasterCard Card members.