import requests
headers = {
'APIKey': '6C135EDF-C37C-4039-AEF3-5DFC079F9E6A',
'Username': 'Statementone',
'Password': 'sonedemo'
}
r = requests.get('https://api2.redtailtechnology.com/crm/v1/rest/', n
headers=headers)
print(r)

import requests
import base64

APIKey = '6C135EDF-C37C-4039-AEF3-5DFC079F9E6A'
Username = 'Statementone'
Password = 'sonedemo'

token = APIKey + ':' + Username + ':' + Password
b64Val = base64.b64encode(token)

headers = {'Authorization': 'Basic %s' % b64Val}

r = requests.get('https://api2.redtailtechnology.com/crm/v1/rest/contacts', headers=headers)
print(r)