Mortgage Calculator

 

"This is an Apex class in Salesforce that makes an HTTP callout to an external API called 'mortgage-calculator-by-api-ninjas.' The purpose of this code is to retrieve mortgage-related data by sending a GET request to that API and then processing the response.

Here's a breakdown of what it does:

1. It has a method called 'Call' that can be invoked from elsewhere in Salesforce. This method takes a set of input parameters provided as a Map of key-value pairs.

2. Inside the 'Call' method:

   • It constructs a URL with query parameters based on the input parameters using the 'CreateInputUrlParams' method.

   • It creates an HTTP GET request with the constructed URL and necessary headers using the 'PrepareServiceRequest' method.

   • It sends the HTTP request to the external API using the 'SendRequest' method and receives an HTTP response.

   • It debugs the status and body of the HTTP response.

   • It then deserializes the JSON response body into a Map of key-value pairs.

3. The 'CreateInputUrlParams' method is responsible for constructing the URL with query parameters based on the input data. It checks if various parameters are provided in the input Map and appends them to the URL.

4. The 'PrepareServiceRequest' method sets up the HTTP request with the appropriate endpoint URL and headers required to access the external API.

5. The 'SendRequest' method sends the HTTP request and handles potential callout exceptions, providing debugging information.

In essence, this code serves as a bridge between Salesforce and an external mortgage calculator API, allowing Salesforce to retrieve mortgage-related data by sending specific parameters to the API and then processing the API's response."