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# Selling Subscriptions on the Post Purchase page: limitations


### Overview
Offering subscriptions as post-purchase upsells can enhance customer retention and generate recurring revenue. However, Shopify imposes specific limitations on post-purchase subscription offers to ensure a seamless and secure shopping experience.

###### Key Limitations

1. **Existing Subscription Orders**
Post-purchase subscription offers cannot be added to orders that already contain subscription products. If a customer's initial purchase includes a subscription, only one-time products can be offered post-purchase.
    
2. **Modification Restrictions**
It's not possible to modify or add a subscription to an order with an existing subscription through post-purchase offers. Additionally, converting a one-time purchase into a subscription order post-purchase is not permitted.
    
3. **Payment Method Constraints**
Certain payment methods, such as installment services or digital wallets (e.g., Klarna, Affirm, Apple Pay, Amazon Pay, Google Pay), do not support post-purchase offers, including subscriptions.
    
4. **Order Characteristics**
Orders without a shipping address or those designated for local delivery are ineligible for post-purchase subscription offers. This includes digital products or local pickup orders.

More on post purchase limitations can be found in [Shopify's Documentation](https://shopify.dev/docs/apps/checkout/product-offers/post-purchase/subscriptions).


**Related Articles**
* [How to Upsell to Subscriptions on the Post-Purchase Page](https://help.upsellplus.com/en/article/how-to-upsell-to-subscriptions-on-the-post-purchase-page-1pg203s/)    
* [Which Payment Methods Can Be Used to Trigger a Post-Purchase Page Offer?](https://help.upsellplus.com/en/article/which-payment-methods-can-be-used-to-trigger-a-post-purchase-page-offer-1ulkynk/)