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STOCKHOLM, Aug 18 (Reuters) - Klarna (KLAR) stock fell 19% before the bell on Tuesday after the the Swedish "buy now, pay later" services ‌provider and online bank, trimmed its full-year GMV ‌to between $149 billion and $151 ​billion, from ​greater than $155 billion seen previously, citing "a more measured view of primarily ​German volumes, ‌our largest market by volume."

The company posted a ‌profit in the second quarter ​while analysts had expected a net loss, helped by growth in its U.S. markets.

The company said its quarterly net ‌profit was $9 ⁠million compared with a loss of $53 million in the year-earlier ⁠period, ahead of expectations of a loss of $17.4 million. Adjusted operating income ​was $91 million ​versus $29 million ​a year ago, ‌it added.

Klarna's April-June revenue grew 27% to $1.04 billion, beating expectations of $993.8 million.

Its gross merchandise volume (GMV), a metric for measuring sales, rose 18% to $36.6 billion in ‌the quarter. GMV in ​the U.S. rose ​27%.

(Reporting ​by Supantha Mukherjee in Stockholm, editing ​by Terje Solsvik)