Zynga, American Express team for digital rewards program

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Zynga is partnering with American Express to introduce Serve Rewards, a new loyalty program tied to the financial services provider's Serve digital wallet. Gamers can earn Zynga virtual game cash by planting an interactive Serve Money Tree on their FarmVille property. The companies will also launch the co-branded Zynga Serve Rewards Card, which generates additional Farm Cash rewards when consumers make virtual purchases. Release