Chapter 12: addParam() Function
Introduction
The addParam() function in AVAP™ is a powerful tool used to add parameters to an API call in the query string. This parameter is assigned to a variable and acts as a bridge between the API call and the API itself, allowing smooth and efficient communication between both.

Usage of addParam
The addParam() function is used to add parameters to an API call in the query string. The basic syntax of this function is as follows:

addParam(variable, value)
Where variable is the name of the variable to be used as a parameter in the API call, and value is the value assigned to this variable.

Example Usage
Below is a practical example illustrating how to use the addParam() function in an API call:

# API call with addParam() 
addParam(user, user_var) 
addParam(password, password_var)
In this example, two parameters, user and password, are being added to an API call. The value of user is set to user_var and the value of password is set to password_var.

Internal Operation
Internally, the addParam() function constructs the querystring for the API call by adding the specified parameters along with their corresponding values. This querystring is passed to the API, which uses it to process the request and return the appropriate response.

Important Considerations
It is important to ensure that the parameters added with addParam() are valid and correctly formatted according to the requirements of the API being called. Additionally, it is the developer's responsibility to ensure that the values assigned to the parameters are secure and do not contain malicious data that could compromise system security.

Conclusions
The addParam() function in AVAP™ is an essential tool for constructing and managing API calls, facilitating communication between the client and the server. By understanding how this function works and how it is used in the context of an API call, developers can create more robust and secure applications that make the most of web services' potential.