NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the merger of RYVYL Inc. (NASDAQ: RVYL) and RTB Digital, Inc. is fair to RYVYL shareholders. Upon closing of the proposed transaction, RYVYL shareholders will own approximately 15.15% of the combined company. Halper Sadeh encourages RYVYL shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at (212) 763-0060 or sadeh@halpersadeh.co. ...