Default shipping method in Express Checkout

The integration has to have a default shipping method and it selects the first one by default. You can use the isDefaultShippingMethod function to have more control over it. The first shipping method which returns a truthy value will be a new default.

Signature of the function:

import { Cart, ShippingMethod } from '@vsf-enterprise/commercetools-types';

(shippingMethod: ShippingMethod, index: number, shippingMethods: ShippingMethod[]): boolean

Example implementation:

// middleware.config.js

module.exports = {
  integrations: {
    paypal: {
      location: '@vsf-enterprise/paypal-commercetools/server',
      configuration: {
        paypalApi: {
          isDefaultShippingMethod(shippingMethod) {
            return shippingMethod.label === 'Express EU';
          }
        }
      }
    }
  }
};

If the function doesn't find a matching shipping method, the application will pick the first element in the array.