3D Secure is an extra step in the payment process, known to consumers as Verified by Visa of Mastercard Securecode, whereby they are directed to their bank to enter a password to verify the payment. I [..]

An array is a special variable which can hold many values under a single name, and you can access the values by referring to an index number.

An acronym of Application Programming Interface, specifies how two pieces of software communicate. For example WHMCS uses the eNom API to community domain registration requests to eNom. The WHMCS soft [..]

A Boolean data type is a data type with only two possible values: true or false.

The frequency with which a service will generate invoices, such as monthly, semi-annually and annually.

The module creation function is the process by which WHMCS sends the signal to the server/service telling it to create the necessary account. The credentials entered under the client's Products/S [..]

A number with decimal amounts. Mostly with two decimal places, but in some situations can have more. xx.xx

An email address formatted with an @ symbol

An integer is a number that is written without a fractional component. For example, 21, 4, and −2048 are integers; 9.75, 5½, and √2 are not integers. The set of integers consists of the natural number [..]

Json is an open standard format that uses human-readable text to transmit data objects consisting of attribute–value pairs. It is used primarily to transmit data between a server and web application, [..]