Installing the app on Huawei from AppGallery

Launch AppGallery

Enter "EasyMerch" in the search and click Install or follow the link

If an error occurs, click Settings

In the window that opens, click "Allows app from this source". You can also find this item by going to Device settings > Password & security > System security > Installation Sources

Launch AppGallery. Type "EasyMerch" in the search and click Install