base64 payload sample

payload.py

import base64

with open("image.png", "rb") as image_file:
  encoded_image_string = base64.b64encode(image_file.read())

payload = {
 "mime" : "image/png",
 "image": encoded_image_string,
 "some_other_data": None
}

# If you want to decode 
image_as_bytes = str.encode(payload.image)  # convert string to bytes
img_recovered = base64.b64decode(image_as_bytes)
try:
  with open("uploaded_" + filename, "wb") as f:
    f.write(img_recovered)
    
with open("615.pdf","rb") as pdf_file:
    encoded_pdf_string = base64.b64encode(pdf_file.read())