Fix for PayPal config. Add missing error_url setting.

Reference ECOM-2516

playbooks/roles/ecommerce/defaults/main.yml

@@ -77,6 +77,7 @@ ECOMMERCE_PAYPAL_CLIENT_ID: 'SET-ME-PLEASE'
 ECOMMERCE_PAYPAL_CLIENT_SECRET: 'SET-ME-PLEASE'
 ECOMMERCE_PAYPAL_RECEIPT_URL: '{{ ECOMMERCE_LMS_URL_ROOT }}/commerce/checkout/receipt/'
 ECOMMERCE_PAYPAL_CANCEL_URL: '{{ ECOMMERCE_LMS_URL_ROOT }}/commerce/checkout/cancel/'
+ECOMMERCE_PAYPAL_ERROR_URL: '{{ ECOMMERCE_LMS_URL_ROOT }}/commerce/checkout/error/'
 
 ECOMMERCE_PAYMENT_PROCESSOR_CONFIG:
     cybersource:
@@ -95,6 +96,7 @@ ECOMMERCE_PAYMENT_PROCESSOR_CONFIG:
       client_secret: '{{ ECOMMERCE_PAYPAL_CLIENT_SECRET }}'
       receipt_url: '{{ ECOMMERCE_PAYPAL_RECEIPT_URL }}'
       cancel_url: '{{ ECOMMERCE_PAYPAL_CANCEL_URL }}'
+      error_url: '{{ ECOMMERCE_PAYPAL_ERROR_URL }}'
 
 # Theming
 ECOMMERCE_PLATFORM_NAME: 'Your Platform Name Here'