A Newton man will have to pay $700,000 in fines and restitution for paying kickbacks to employees at a regional transit authority to divert transportation services paid for by the state’s Medicaid program to five of his companies, the attorney general’s office said Thursday. Alexander Shrayber, 57, also received a suspended sentence of 2½ years in the House of Correction. Shrayber pleaded guilty in June to two charges of Medicaid kickbacks and four counts of corrupt gifts, offers, or promises to influence official acts, the attorney general’s office said. He was sentenced Thursday in Worcester Superior Court. Shrayber owned five transportation businesses that contracted work with the Montachusett Regional Transit Authority. Administrators at the authority cooperated with the investigation, the attorney general’s office said.