The standard payment receipt does not include the invoice line item. A sample payment receipt is provided below:

To add the invoice details, follow these steps: navigate to Setup, select Classic Email Templates, choose Receipt Template, and then click on the Edit Template button as shown below:

You will be directed to the template editor. Insert the following line where you want the invoice details displayed:

<apex:outputText rendered="{!(s.fw1__Selected_Invoice_Line_Fields__c != null)}">
<div class="invoice-line-table" styleClass="width:100%">
<c:InvoiceLinesDynamic invoiceId="{!Relatedto.fw1__Invoice__c}" />

For example:

Save the template.

A sample payment receipt with Invoice Line Item is shown below: