NEW YORK (TheStreet) — eBay (EBAY_) was falling -0.2% to $49.58 Monday following a report that same-store sales slowed in May.

According to ChannelAdvisor same-store sales grew 11.5% from the year-ago month, down from 14% in April and 17.8% in March. Auction same-store sales fell -11.1% in the month, while fixed-price grew 13% and Motors grew 15.6%. According to the report changes to Google‘s (GOOG_)algorithm changes likely impacted the online retailer’s sales.

The launch of Amazon.com‘s (AMZN_) PayPal competitor Amazon Payments also impacted eBay’s stock.

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