How do I enter multiple charges on my API?

[TLCMaine]

How do I charge for multiple items on my small desktop card reader? EG. customer charged for service item, then wants to add a gift certificate, and pay a couple overdue invoices?

[_Violet]

Hi @TLCMaine - Thanks for reaching out to us with your question. I see this is one of your first posts in the Seller Community so I'd like to officially welcome you! 🎉👏

You can add both the service item and gift certificate to the same sale, but you would need to take their payment towards their Invoice from the Invoice section within your Point of Sale or Dashboard because this will attach it to the Invoice. If you take a payment via checkout for an Invoice, it will be counted as a separate payment. 

I hope this information is helpful but please do let me know if you have any additional questions by replying in this thread.