Using WhatsApp's Business Cloud API, how can I send a reminder message with a calendar event that my customers can easily add to their device calendar? I didn't find any way to do it.

I am using the Whatsapp Business API and I am testing my app using their test format, which gives you a test number and you can add your personal phone number to receive the test template. I am correctly receiving the test template from Meta to my phone number, however when I actually test my app, by me sending a message to that test number, this error shows up:

response: { status: 400, statusText: 'Bad Request', headers: Object [AxiosHeaders] { vary: 'Origin, Accept-Encoding', 'x-business-use-case-usage': '{"199147949938479":[{"type":"whatsapp","call_count":1,"total_cputime":1,"total_time":1,"estimated_time_to_regain_access":0}]}', 'content-type': 'application/json', 'www-authenticate': 'OAuth "Facebook Platform" "invalid_request" "(#131030) Recipient phone number not in allowed list"',

My phone number is definitely in the allowed list as I am receiving their test template with no problems. Maybe there is a problem with my area code? I am from Argentina and my area code is +54. It also has a 9 before the actual phone number. I tried with and without the 9 and in all possible format. No results. Any clues what may be?

when i try to add phone number on cloud whatsapp official API i receive error "this whatsapp business account does not have permission to add phone numbers to the account"

error "this whatsapp business account does not have permission to add phone numbers to the account"

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)```