(Reuters) - PayPal Holdings Inc reported a 13% fall in fourth-quarter profit on Wednesday, as it spent more on acquisitions and technology.The company's net income fell to $507 million (386 million pounds), or 43 cents per share, in the quarter ended Dec. 31, from $584 million, or 49 cents per share, a year earlier.Total revenue rose to $4.96 billion from $4.23 billion.