feat(common): PAYPAL-7 Pass in merchant ID on PayPal button script for PayPal Express Checkout

Author: bc-fetisov

src/script-loader.spec.ts

@@ -80,6 +80,7 @@ describe('ScriptLoader', () => {
         it('attaches script tag to document with data attributes', async () => {
             await loader.loadScript(
                 'https://code.jquery.com/jquery-3.2.1.min.js',
+                undefined,
                 {'data-attribute1': '1', 'data-attribute2': '2'});
 
             expect(script.attributes.getNamedItem('data-attribute1')!.value)