How Do I Pass JSON in header of Python Script?

First of all, let me say that I've never done Python before. I want to know how I can pass JSON

{  
  "data": {
    "attributes": {
      "url": "https://www.example.com",      
      "subscriptions": [        
          "rule.created"      
      ]    
   }  
 } 
}

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Into the header of my script. Here is the test script (I didn't write it and I have removed sensitive data, keys etc.)

#To install Requirements, use: pip3 install -r requirements.txt
#Documentation: https://developer.adobelaunch.com/api/

import json
import time
import jwt
import datetime
import os
from datetime import datetime, timedelta, timezone, date
import requests
import csv
import sys

# BOTW Account

org_id = ""
tech_id = ""
api_key = ""
secret = ""
company_id = ""
key_path = ""
property_id = ""

def createJWT():

   expiryTime = int(time.time()) + 300

   data = {
      "exp": expiryTime,
      "iss": org_id,
      "sub": tech_id,
      "https://ims-na1.adobelogin.com/s/ent_reactor_sdk": True,
      "aud": "https://ims-na1.adobelogin.com/c/" + api_key
   }
 
   with open(key_path,"rb") as readFile:
      privateKey = readFile.read()
 
   encoded = jwt.encode(data, privateKey, algorithm="RS256")
   #print('encoded: ', encoded)
   return encoded

#print("createJWT: ", createJWT())

def accessToken():

   encoded = createJWT()
   #print("encoded: ", encoded)
   #encoded = "eyJhbGciOiJSUzI1NiJ9"
   exchangeEndpoint = "https://ims-na1.adobelogin.com/ims/exchange/jwt"
   header_jwt = {'cache-control':'no-cache','content-type':'application/x-www-form-urlencoded'} ## setting the header

   exchangeData = {
      "client_id": api_key,
      "client_secret": secret,
      "jwt_token": encoded,
      'x-api-key': api_key,
       'x-gw-ims-org-id': org_id
   }

   #print("exchangeData: ", json.dumps(exchangeData, indent=4, sort_keys=True))

   exchangeResponse = requests.post(exchangeEndpoint, headers=header_jwt, data=exchangeData)

   #print("exchangeResponse: ", exchangeResponse.text)

   token = exchangeResponse.json()['access_token']
   #token = exchangeResponse.json()
   

   #token = "eyJhbGciOiJS"

   #print("token: ", json.dumps(token, indent=4, sort_keys=True))
   return token

def checkKey(dict, key): 
      
    if key in dict.keys(): 
        return True
    else: 
        return False 


def apiConn(url):
   token = accessToken()
   #print('token: ', token)
   #token = token['accessToken']
   #print("bearer Token: ", token)

   
   #header_jwt = {'cache-control':'no-cache','content-type':'application/x-www-form-urlencoded'} ## setting the header

   # create payload
   header_jwt = {
       'authorization' : 'Bearer ' + token,
       'Accept' : 'application/vnd.api+json;revision=1',
       'Content-Type': 'application/vnd.api+json',
       'x-api-key': api_key,
       'x-gw-ims-org-id': org_id
   }
   #print('url: ', url)
   response = requests.get(url, headers=header_jwt)
   #print('response: ',    response)
   apiResponse = response.json()
   
   return apiResponse

#url = "https://reactor.adobe.io/properties/" + property_id + "/rules"
url = "https://reactor.adobe.io/properties/" + property_id + "/callbacks"
#print('url: ', url)

apiResponse = apiConn(url)
print('apiResponse', json.dumps(apiResponse,indent=4, sort_keys=True))
print('Processing Complete')

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Thanks!