References in code to "payload" where does it come from?

[johncblacker]

I'm trying to take advantage of your code in a uPy program to push an image to pushbullet and have been trying to understand your code in order to adapt it for my purposes. I tried calling the uploader.py "make_request" function with the output from my first call to pushbullet which obtains the url used to upload among other things. Here's my output from that call:

---

upload_url : https://upload.pushbullet.com/upload-legacy/EJz498Ega15yxUIPviAP7J6JlttKEbXb
data : {'key': 'Z6bJNYKElcJeappWL52cNGXutU1U1aYO/jetfire40.jpg', 'awsaccesskeyid': 'AKIAJJIUQPUDGPM4GD3W', 'acl': 'public-read', 'policy': 'eyKjb25kaXRpb25zIjTE6MzcuMjM0MTMwWiJ9', 'signature': 'UX5s1uIy1ov6+xlj58JY7rGFKcs=', 'content-type': 'image/jpeg'}
file_url : https://dl3.pushbulletusercontent.com/Z6bJNYKElcJeappWL52cNGXutU1U1aYO/jetfire40.jpg
file_type : image/jpeg
file_name : jetfire40.jpg

---

When I call the make_request function thusly:

respd = json.loads(resp.text)
for key, value in respd.items():
print(key, ' : ', value)
data, headers = make_request(data=respd, image='jetfire40.jpg')
<<<<<<<<<<<<<<<<<<<<<<<<<<
I get an error:
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
TypeError: join expects a list of str/bytes objects consistent with self object
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
But, I'm sure it's because I don't understand the semantics of your code. Can you help? I'm using urequests and therefore have to pass it a multipart/form-data as I understand it because urequests doesn't support the "files" parameter that requests does.
Thanks for any help you can provide. FWIW, pushbullet's api doc is fairly useless in figuring things out.