import requests
import json

url = 'https://v2.convertapi.com/convert/pdf/to/jpg?Secret=******' # Hidden
headers = {'content-type': 'application/json'}
payload = {
    'Parameters': [
        {
            'Name': 'File',
            'FileValue': {
                'Url': 'to be populated'
            }
        },
        {
            'Name': 'StoreFile',
            'Value': 'true'
        }
    ]
}

a = ['https://www.bachmann.com/fileadmin/02_Produkte/03_Anschlussfelder/CONI/Downloads/CONI_3-4-6-way_Mounting_instructions_REV05.pdf','test2.jpg','test3.jpeg','test4.png','test4.exe']

for x in a:

  if x[-3:] == 'pdf':
    payload['Parameters'][0]['FileValue']['Url'] = x
    response = requests.post(url, data=json.dumps(payload), headers=headers)
    print(response)

  elif x[-3:] == 'jpg' or x[-3:] == 'png' or x[-4:] == 'jpeg':
    print('thats an image, nothing to do here')