[bug]: integration_key should not be bundled into the app

[tate2301]

I generally think that the integration_key should not be bundled into the client side code. I didn't think about that when I initially built this. Its a fork of the paynow package which is meant to be used at the server side hence this wasn't a concern for them.

[zaynekomichi]

Only solution is to have a server handle the backend part and just make this a ui wrapper for the payment wall, like stripe
Working on a similar solution