I have now answered my original question by creating a really simple B4A wrapper library to the PayPal REST SDK version 1.
The attached has the wrapper library, java source for the wrapper, and B4A example. You will need to supply the PayPalAndroidSDK.jar library from the SDK itself to use the wrapper. You will need other files from the SDK if you want to create a new wrapper from the java source. If you want to use any mode other than NO_NETWORK, you will need credentials from developer.paypal.com
Please get the SDK and read its enclosed documentation to help understand how the pieces fit together.
Thank you, Erel, for making B4A such a great development product to work with.
Update: PayPal now has version 2.02 of the SDK that is no longer compatible with this wrapper.