I would like to know if there's a way to send a POST (or GET) HTTP request to a certain URL while a customer is created or updated in the Salesforce CRM.
I need to get the new customer's details, and create an account in a different system with those details, right after the user is created / updated in Salesforce. I want to do that by creating a PHP application that will get a POST request from Salesforce, and send an API request with the customer's details to the API of a different system, i.e. on every trigger of update / creation of a customer, Salesforce will send a POST request to a predefined URL. 
I saw that there's an option to use streaming API in Salesforce, but I couldn't find an option to send a POST / GET request with the customer's details right after creating / updating a customer in the Salesforce CRM.
It's also possible for us to only get the customer's ID, and our application will retrieve the rest of the customer's details by an API call to Salesforce.
Your help is appreciated.