what is callback function?Give example.
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Callback function enables the interaction to fetch the data from the external application. In many modern applications, it’s common to interact with external services, APIs, or data sources. Callback functions are used to handle the results of these interactions. They allow a program to make a request to an external application (or service) and handle the response asynchronously. Example: Fetching Data from an External Application (API) with a Callback Function
Example: Payment Gateway Integration with Callback.
When integrating a payment gateway into your app or website, the payment process involves initiating a payment request and handling the response asynchronously. After the user makes a payment, Paytm sends a response to a callback URL that you have defined, and your app processes the result.
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