I'm trying to generate the response for the WhatsApp flow using the WhatsApp business API with the following code

The decryption part is functioning correctly, but when I attempt to send the response, I'm receiving the error: "Could not decrypt the response received from the server."

I've referred to the documentation here, but I'm still struggling to find the correct approach for generating and validating the response.

Is there anyone who has experience with this API or can provide guidance on how to properly format and send the response? Any examples or links to relevant resources would be greatly appreciated.

def post(self, request, *args, **kwargs):         try:             dict_data = json.loads(request.body.decode('utf-8'))             encrypted_flow_data_b64 = dict_data['encrypted_flow_data']             encrypted_aes_key_b64 = dict_data['encrypted_aes_key']             initial_vector_b64 = dict_data['initial_vector']                          flipped_iv = self.flip_iv(initial_vector_b64.encode('utf-8'))                          encrypted_aes_key = b64decode(encrypted_aes_key_b64)             key_private = open('*******.pem', 'rb').read().decode('utf-8')             private_key = load_pem_private_key(key_private.encode('utf-8'), password="*************".encode('utf-8'))                          aes_key = private_key.decrypt(encrypted_aes_key, OAEP(mgf=MGF1(algorithm=hashes.SHA256()), algorithm=hashes.SHA256(), label=None))             aes_key_b64 = b64encode(aes_key).decode('utf-8')                          flow_data  = b64decode(encrypted_flow_data_b64)             key = b64decode(aes_key_b64)             iv = b64decode(initial_vector_b64)                          encrypted_flow_data_body = flow_data[:-16]             encrypted_flow_data_tag = flow_data[-16:]             cipher = Cipher(algorithms.AES(key), modes.GCM(iv,encrypted_flow_data_tag))             decryptor = cipher.decryptor()             decrypted_data = decryptor.update(encrypted_flow_data_body) + decryptor.finalize()             flow_data_request_raw = decrypted_data.decode("utf-8")                          hello_world_text = "HELLO WORLD"                          response_data = {                 "version": "3.0",                 "screen": "MY_FIRST_SCREEN",                 "data": {                     "hello_world_text": hello_world_text                 }             }             response_json = json.dumps(response_data)                          # Obtendo a chave AES após descriptografar encrypted_aes_key             fb_aes_key = private_key.decrypt(encrypted_aes_key, OAEP(mgf=MGF1(algorithm=hashes.SHA256()), algorithm=hashes.SHA256(), label=None))             # Usando a chave AES para criptografar a resposta             response_cipher = Cipher(algorithms.AES(fb_aes_key), modes.GCM(iv))             encryptor = response_cipher.encryptor()             encrypted_response = (                 encryptor.update(response_json.encode("utf-8")) +                 encryptor.finalize() +                 encryptor.tag             )             encrypted_response_b64 = b64encode(encrypted_response).decode("utf-8")                          # Construct the final response             final_response = {                 "encrypted_flow_data": encrypted_response_b64,                 "encrypted_aes_key": encrypted_aes_key_b64,                 "initial_vector": initial_vector_b64             }                          return JsonResponse(final_response, status=200)         except Exception as e:             print(e)             return HttpResponse(status=500, content='ok')          def flip_iv(self, iv):         flipped_bytes = []         for byte in iv:             flipped_byte = byte ^ 0xFF             flipped_bytes.append(flipped_byte)         return bytes(flipped_bytes) 

The entire decoding part is working normally but when returning the response I receive the error "Could not decrypt the response received from the server. "I can't find how to send the correct answer or how to validate it. The documentation can be found at https://developers.facebook.com/docs/whatsapp/flows/reference/implementingyourflowendpoint#data_exchange_request

Can anyone help me or show me a link I can test?

I am building WhatsApp Flow to retrieve orders. I am receiving the request and decrypting the message successfully. But I have trouble to encrypt response to WhatsApp. I got error: Invalid response from endpoint. I am using Python 3.9 and Pipedream. Some help?

See my encrypt code bellow:

from base64 import b64decode, b64encode from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes import json def handler(pd: "pipedream"):     # Getting the decrypted AES key and IV     aes_key_b64 = pd.steps["Decrypt_WhatsApp_Key"]["$return_value"]["decrypted_aes_key"]     iv_b64 = pd.steps["trigger"]["event"]["body"]["initial_vector"]     # Decoding AES key and base64 IV to bytes     aes_key = b64decode(aes_key_b64)     iv = b64decode(iv_b64)     # Preparing the inverted IV     iv_flipped = flip_iv(iv)     # Preparing response     response = {         "version": "3.0",         "screen": "SUCCESS",         "data": {             "extension_message_response": {                 "params": {                     "flow_token": pd.steps["Decrypt_WhatsApp_Message"]["$return_value"]["flow_token"],                     "status": pd.steps["shopify_developer_app"]["$return_value"]["orders"][0]["id"]                 }             }         }     }     response = json.dumps(response)     # Encrypting the response     cipher = Cipher(algorithms.AES(aes_key), modes.GCM(iv_flipped))     encryptor = cipher.encryptor()     encrypted = encryptor.update(response.encode("utf-8")) + encryptor.finalize() + encryptor.tag     encrypted_response = b64encode(encrypted).decode("utf-8")     # Response return     return {         "status": 200,         "body": encrypted_response,         "headers": {             "Content-Type": "application/json"         }     } def flip_iv(iv):     flipped_bytes = []     for byte in iv:         flipped_byte = byte ^ 0xFF         flipped_bytes.append(flipped_byte)     return bytes(flipped_bytes)``` 

1. I am a quite sure that, the number used in Whatsapp business api can not be used directly in whatsapp app or whatsapp business app, still can anyone confirm that??

2. If to receive and respond to the user Initiated message we need to form an UI interface, what are the possibilities and what is the best option to do so??

• One, I thought was created our own chat UI, which I think will be time consuming and complicated.
• Second, I am looking toward twilio's chat and conversation option. It is mentioned on twilio site that twilio-chats is depreciated. So I was looking forward to use twilio conversation.

But before going deep into twilio conversation apis and their documentation I would like to know if it will fit my use case.

Need - Can I use twilio conversation such that, I can connect my verified sender to 3-4 separate whatsapp numbers to respond form their individual whatsapp or whatsapp-business app, to all the user initiated conversation.

If possible can I get some specific documentation or guidance for it??

I have configured the Google ads conversions with GTM. Google ads conversions are high when compared to GA4. GA4 is linked to the Google ads account but was set as secondary. Primary conversion is configured with GTM. I know there will be bit discrepancies but I am facing a huge difference.

Google Ads configured via GTM and GA4 is linked with Google Ads. However, I am seeing higher conversions in Google ads for purchase and low conversion value in GA4 when I select source/ medium revenue.

I´d like to use the Google Ads API to programmatically retrieve ads data from my Google Ads account. I`d like to use a PHP script (Laravel command and the Google Ads API PHP client library) triggered by a cron-job to retrieve this data regularly. After reading the documentations a couple of times I still have a few questions:

Q1: My understanding is that for such "program to program" API access with no user involvement, I need to follow the service account authentication scenario. Is that right?

Q2: The service account documentation says that I have to have Google Workspace Domain with my company domain, email address, etc. My company website, email is hosted by another provider, do I really need to pay for the Google Workspace Domain, just to be able use the Google Ads API? Any alternative solutions?

Thanks for any suggestions on how to do this right. W.