CIM and Accept.js Testing for declined card?

[yabdab]

I am setting up CIM with Accept.js and all works fine using test cards for sandbox.

I need to test when the card entered is declined and code to handle it.

I tried adding the zip code 46282 to fore a decline, but that did not work.

How can I force a request to create a customer profile + pay profile that fails?

Thanks.

Using PHP sdk