We are about to start developing a feature that will allow users to sell/buy physical assets within the application. The buying and selling process requires, at a certain point in the flow, that the buyer requests the seller to verify the goods. The seller who receives the verification request will carry out some operations in the app to guarantee the buyer the effective existence of the good offered for sale (for example taking photo, videos, etc.). What has just been described is a paid feature for buyers which requires the payment of a fee to our company for the service. We wonder if the In App Purchase system is suitable for this business model or if we should integrate a third-party payment system.