make_sticker.py

def make_sticker(url):
    response = requests.get(url)
    im = Image.open(BytesIO(response.content))
    foreground = ImageOps.fit(im, mask.size, centering=(0.5, 0.5))
    foreground.putalpha(mask)

    background = Image.open("media/background.png")

    background.paste(foreground, (1905, 970), foreground)
    background.save("media/output.png")
    upload_result = client.upload_from_path("media/output.png")

    return upload_result['link']