The online payment feature in NutriAdmin can send payment requests and reminders. However, a more detailed invoice and receipts are currently unavailable. Since NutriAdmin integrates with Stripe, this functionality can be managed on Stripe's platform. To accomplish this:

Step 1: Initiate the payment through NutriAdmin with Stripe.

Step 2: Configure Stripe to automatically send a receipt/invoice via email for each payment.

Step 3: Set up this feature once in your Stripe account, and it will apply to all future payments.

For more details, refer to the tutorial by Stripe here. Explore Stripe's interface and reach out to their support for assistance if needed.