This is a huge WIP, hopefully at some point I won't have to worry about any of this garbage.

vrChatAPIShim.py

import argparse
import json
import requests
import sys
import time

try:
   input = raw_input
except NameError:
   pass

offset = 0
numOfFriends = 0
messageText = ""
usrID = ""

parser = argparse.ArgumentParser(description='VRChat Python Shim.')
parser.add_argument('username', metavar='U', type=str, nargs='+', help='username')
parser.add_argument('message', metavar='M', type=str, nargs='+', help='message')
args = parser.parse_args()
messageText = ''.join(args.message)
usrID = ''.join(args.username)

try:
    with open('apiKey', 'r') as myfile:
        api = myfile.read().replace('\n', '')
except IOError:
    apiFull = requests.request("GET", "https://api.vrchat.cloud/api/1/config")
    data = json.loads(apiFull.text)
    api = data['apiKey']
    file = open("apiKey", 'w')
    file.write(api.replace('\n', ''))
    file.close()

try:
    with open('authKey', 'r') as myfile:
        auth = myfile.read().replace('\n', '')
except IOError:
    file = open("authKey", 'w')
    auth = input('Please input your Auth Key: ')
    file.write(auth.replace('\n', ''))
    file.close()

try:
    with open('authorizationKey', 'r') as myfile:
        authorizationKey = myfile.read().replace('\n', '')
except IOError:
    file = open("authorizationKey", 'w')
    authorizationKey = input('Please input your Authorization Header : ')
    file.write(authorizationKey.replace('\n', ''))
    file.close()

if messageText == "":
   messageText = input("What's the message: ")
if usrID == "":
   usrID = input("usrID: ")

headersFriends = {
    'authorization': authorizationKey,
    'cache-control': "no-cache",
    }

headersMessage = {
    'Cache-Control': "no-cache",
    'type': "message",
    'message': messageText,
    'Content-Type': "application/x-www-form-urlencoded",
    'Authorization': authorizationKey,
    }

urlUser = "https://api.vrchat.cloud/api/1/user/"
urlFriends = "https://www.vrchat.net/api/1/auth/user/friends"
urlUserAuth = "http://api.vrchat.cloud/api/1/auth/user"

payloadMessage = "type=all&message="+messageText
sendMessage = {"auth":auth,"apiKey":api}
querystringFriends = {"auth":auth,"apiKey":api,"offline":"false","offset":offset}
   
if messageText != "":
   notifURL = urlUser + usrID + "/notification"
   messageSend = requests.request("POST", notifURL, data=payloadMessage, headers=headersMessage, params=sendMessage)
   totalResponse = json.loads((messageSend.text).encode('utf8'))
else:
   response = requests.request("GET", urlUserAuth, headers=headersFriends, params=querystringFriends)

   userAuth = json.loads(response.text)

   for values in userAuth['friends']:
      numOfFriends += 1

   offSetGoal = numOfFriends // 100 * 100

   time.sleep(5)
   friendsList = requests.request("GET", urlFriends, headers=headersFriends, params=querystringFriends)
   totalResponse = json.loads((friendsList.text).encode('utf8'))
   while offSetGoal != offset:
      time.sleep(8)
      friendsList = requests.request("GET", urlFriends, headers=headersFriends, params=querystringFriends)
      offset += 100
      my_list = json.loads((friendsList.text).encode('utf8'))
      totalResponse = totalResponse + my_list
totalDumps = json.dumps(totalResponse, sort_keys=True, indent=4)

file = open("output.json", 'w')
file.write(totalDumps)
file.close()