Module development and code questions

Hi,

In a custom module, in the build form, I have to insert some fields and I need to display others at the push of a button.
Do you know if it is possible?

Hello everyone.

I'm building a custom module for drupal that will allow users to capture an image with their phone and save it to the database. I have the webRTC library that I'm going to use for the capturing and I have an idea of how to store the image once it is captured.

I create a Checkbox in the Checkout Flow, CheckoutPane. How i can send the Value of the Checkbox to a Entity in the User-Profile or the Order.

Description: I need a Checkbox in the CheckoutPane, when the Customer select the Checkbox and click submit i must save the value in a Field in the Order or Profile of the specific user with the date. When the customer select the checkbox first time, its hidden for future orders.