Using 2 payment processors with Webform CIVI intergration
In general you can find out the values of any field by looking at the markup. If you visit your webform and right-click the payment processor field, select "inspect element" (if you're using a decent webbrowser) it will show you the code.

&lt;option value="0"&gt;Pay Later&lt;/option&gt;
&lt;option value="1" selected="selected"&gt;Test Processor&lt;/option&gt;


So in this example the test processor has a value of 1, pay later has a value of 0.