The Customer Portal Announcement Early Adopter Program allows you to engage customers directly in the customer portal with an announcement banner, maximizing the reach of existing Rewards experiences. This experience is available for Shopify stores with the Retain package.

Common use cases you can implement using this experience:

• Reward punch card: The Customer portal announcement can simulate a punch card that customers would use in a brick-and-mortar store. Consider using a punch card to reward customers for Streak order milestones and Spend milestones. 
• VIP Program/tier education: Let customers know what tier or program they’re in based on conditions you set. For example, you could tell customers that they are a Silver member if they spend at least $200, and reward Silver members with a discount of 25% off.
• Subscription product education: Provide customers with information and benefits about the product they’ve purchased. For example, you can tell customers they will see the best results after 90 days of use.
• Offers and promotions: Announce promotions to customers directly in the customer portal, and let customers know about BFCM cash back or discount  promotions, seasonal cash back or discount promotions, Upcoming sales or promotions

For more information on use cases and step-by-step configuration, see Customer portal announcement Early Adopter Program.