// This end-point will trigger from tyntec when someone messages to your whatsapp number.
server.post('/api/tyntec', async(req, res) => {
 
// process the message received from tyntec
 
 let newConversation = await createBotConversation();
 
// Parse the response from above function to get the conversation_id
 
	let botResponses = await sendConversationToBot(conversation_id,message);
 
 
   // Parse id and mark by splitting the above response. Get the actual user’s message by calling getResponseFromBot function. 
   let responses = getResponseFromBot(id, mark);
   sendMessageToTyntec(responses)
   res.status(200).send("Success");
})
 
//Method to get conversation id by calling directline api.
function createBotConversation (){
   var url = "https://directline.botframework.com/v3/directline/conversations"
   var options = {
       url: url,
       headers: {
           'content-type': 'application/json',
           'Authorization': 'Bearer DirectLine_access_token'
       },
       json: true,
 
   }
   // use request package dependencies and above data to send request through POST method to create new conversation on bot
 
   return response;
}
 
function sendConversationToBot(conversation_id,message){
 
   var url = " https://directline.botframework.com/v3/directline/conversations/ {{conversation_id}}/activities"
   var options = {
       url: url,
       headers: {
           'content-type': 'application/json',
           'Authorization': 'Bearer DirectLine_access_token'
       },
       json: true,
       body: {
           "type": "message",
           "from": {
               "id": "userId"
           },
           "text": "msg from tyntec"
       }
 
   };
 
   // use request package dependencies and above data to send request through POST method to send message to bot
 
   return responses;
}
 
 
function getResponseFromBot(conversation_response_id, mark) {
   var url = "https://directline.botframework.com/v3/directline/conversations/{conversation_response_id }/activities?watermark=${mark}"
   var options = {
       url: url,
       headers: {
           'content-type': 'application/json',
           'Authorization': 'Bearer DirectLine_access_token'
       },
       json: true,
 
   }
   // use request package dependencies and above data to send request through GET method to get response from bot
 
   return responses;
 
};
 
 
function sendMessageToTyntec(responseText) {
   let url = "https://api.tyntec.com/chat-api/v3/messages"
   let options = {
       url: url,
       headers: {
           'content-type': 'application/json',
           'apikey': 'XX---your api key'
       },
       json: true,
       body: {
           "from" : "{{whatsAppBusinessNumber}}", 
           "to" : "{{receiverPhoneNumber}}",
           "channel" : "Whatsapp",
           "content" : {
               "contentType": "text",
               "text": responseText //message goes here
    }
           }
       };
 
   // use request dependencies and above data to send request through POST method and finally send the success status to your function called
 
}