May 6 (Reuters) - Adyen ADYEN.AS, the Dutch company that processes payments for Uber and eBay, met first-quarter revenue expectations on Wednesday, as it continued to process a higher volume of transactions despite slower consumer spending activity.

Net revenue in the quarter ended in March grew 20% on a constant currency basis, reaching 620.8 million euros ($728.3 million). Analysts expected on average revenue of 621.3 million euros with 20% growth, according to consensus data provided by the company.

Processed volume, the value of all payments processed, rose to 382 billion euros, up 13% from last year, and above the forecast of 374 billion euros.

($1 = 0.8524 euros)