from vap.verifier import verify_postback

postback = {
    'version': '4.0',
    'ad-network-id': 'com.example',
    'source-identifier': '5239',
    'app-id': 525463029,
    'transaction-id': '6aafb7a5-0170-41b5-bbe4-fe71dedf1e30',
    'redownload': False,
    'source-domain': 'example.com',
    'fidelity-type': 1,
    'did-win': True,
    'conversion-value': 63,
    'postback-sequence-index': 0,
    'attribution-signature': 'MEUCIGRmSMrqedNu6uaHyhVcifs118R5z/AB6cvRaKrRRHWRAiEAv96ne3dKQ5kJpbsfk4eYiePmr'
                             'ZUU6sQmo+7zfP/1Bxo=',
}

print(verify_postback(postback)) # True