API Callout In Salesforce
So far you have seen how to create Salesforce API. Now, If we want to call an API of any external Application like Stripe, Hubspot, Google Sheets, or Google Slides from Salesforce.
To call an API in Salesforce, HTTP, HTTPRequest, and HTTPResponse classes are used. Here below is the code sample for API callout of currency conversion.
public static void callAPI() {
// Instantiate a new Http object
Http h = new Http();
// Instantiate a new HTTP request, specify the method (GET) as well as the endpoint
HttpRequest req = new HttpRequest();
// Setting endpoint
req.setEndpoint(url);
// Setting Endpoint
req.setMethod('GET');
// Setting URL
String url = 'https://currency-converter5.p.rapidapi.com/currency/convert?format=json&from=AUD&to=CAD&amount=1);
// Setting Headers
req.setHeader('X-RapidAPI-Key', 'Your X-RapidAPI-Key');
req.setHeader('X-RapidAPI-Host': 'Your X-RapidAPI-Host');
// Send the request, and return a response
HttpResponse res = h.send(req);
}