Refer to this help video to go through the entire process in detail on, How to integrate the Feed For Google Shopping App with "Google Merchant Center", "Bing Merchant Center" and "Facebook Business Manager".

Facebook Catalog Creation: https://support.simprosys.com/faq/how-to-create-catalog-in-facebook-business-manager-and-submit-it-in-google-shopping-feed-app

Bulk Edit feature in Feed For Google Shopping: https://support.simprosys.com/faq/how-to-use-bulk-edit-feature-in-google-shopping-feed-gsf-app

Steps for Integration:

1 - Once you hit the "Get" button on App's page on App Store. If prompted by this (see below) screen, please enter the Store's Shop URL. If Shopify sees you are already logged in to your store admin, it will skip this screen and take you to the next step. 

2- Approve the installation of the app. (see below-given screenshot) 

3 - After you have approved the installation, you will be asked to enter the Email ID with which you have created your Google Merchant Center account. 

4 - Once you have approved linking with the Google account, you will be asked to provide which merchant centre you want to link to this Shopify store. 

5 - Once you have connected your Google Merchant Center Account with the app, you will be asked to proceed to next step and select the Google Shopping Product Data feed configurations based on your requirements.

6- If you are submitting your feed to Bing and have created the Bing account with the same Email ID you have logged in to our App, then you will be able to select the Bing Ads and Bing Merchant Center ID from the dropdown.

7 - Once you complete the steps you will have to press the SYNC button and the App will start fetching products' data as per the configuration selected by you. The app has fetched all the products, you are all set to configure the custom labels, Google Shopping Product Categories, Age, Gender, you can also create Promotions Feed, etc on this page.