API and URL callbacks

Hi,

I am new to Zoho creator and need some advice. I am creating an application that involves sends sms's. Sending the SMS is not a problem and I have got going thus far.

I want to receive sms reports so that the status of a message is sent is set to delivered. I have a form that records all the details of the sms and have included a colums that has
1.message status(Pending,Delivered,Failed)
2.Message ID (Which will grab the message ide from the HTTP callback from the service provider)
3.Status code (Which is tha actual status code to be received from the service provider)

Here is an extract from their documentation

Their documentation is attached. They have various methos of sending including xml.

My question is.

1.How do I create a callback URL or use the API to received this xml response
2.How do I update the (a) Status code and (b)message id from the response received

Based on the status code I will update the "message status" to either delivered or failed.

I know this may be a stupid question however I do not fully understand how to use the API effectively

Most likely this post wont get a response however I would appreciate some sort of response even if it is in the negative

Thanks