An example of a invoice for a purchase and installation.
ACME Home Heating
Bill for: New furnace and installation
Customer: Jane Doe
payment due: 2015-01-30
minimum payment: $0.00
total due: $0.00
payment status: paid
order: furnace model ABC123
order: installation labor

<div itemscope itemtype="http://schema.org/Invoice">
  <h1 itemprop="description">New furnace and installation</h1>
  <div itemprop="broker" itemscope itemtype="http://schema.org/LocalBusiness">
    <b itemprop="name">ACME Home Heating</b>
  </div>
  <div itemprop="customer" itemscope itemtype="http://schema.org/Person">
    <b itemprop="name">Jane Doe</b>
  </div>
  <time itemprop="paymentDueDate">2015-01-30</time>
  <div itemprop="minimumPaymentDue" itemscope itemtype="http://schema.org/PriceSpecification">
    <span itemprop="price">0.00</span>
    <span itemprop="priceCurrency">USD</span>
  </div>
  <div itemprop="totalPaymentDue" itemscope itemtype="http://schema.org/PriceSpecification">
    <span itemprop="price">0.00</span>
    <span itemprop="priceCurrency">USD</span>
  </div>
  <link itemprop="paymentStatus" href="http://schema.org/PaymentComplete" />
  <div itemprop="referencesOrder" itemscope itemtype="http://schema.org/Order">
    <span itemprop="description">furnace</span>
    <time itemprop="orderDate">2014-12-01</time>
    <span itemprop="orderNumber">123ABC</span>
    <div itemprop="orderedItem" itemscope itemtype="http://schema.org/Product">
      <span itemprop="name">ACME Furnace 3000</span>
      <meta itemprop="productId" content="ABC123" />
    </div>
  </div>
  <div itemprop="referencesOrder" itemscope itemtype="http://schema.org/Order">
    <span itemprop="description">furnace installation</span>
    <time itemprop="orderDate">2014-12-02</time>
    <div itemprop="orderedItem" itemscope itemtype="http://schema.org/Service">
      <span itemprop="description">furnace installation</span>
    </div>
  </div>
</div>

<div vocab="http://schema.org/" typeof="Invoice">
  <h1 property="description">New furnace and installation</h1>
  <div property="broker" typeof="/LocalBusiness">
    <b property="name">ACME Home Heating</b>
  </div>
  <div property="customer" typeof="Person">
    <b property="name">Jane Doe</b>
  </div>
  <time property="paymentDueDate">2015-01-30</time>
  <div property="minimumPaymentDue" typeof="PriceSpecification">
    <span property="price">0.00</span>
    <span property="priceCurrency">USD</span>
  </div>
  <div property="totalPaymentDue" typeof="PriceSpecification">
    <span property="price">0.00</span>
    <span property="priceCurrency">USD</span>
  </div>
  <meta itemprop="paymentStatus" content="PaymentComplete" />
  <div property="referencesOrder" typeof="Order">
    <span property="description">furnace</span>
    <time property="orderDate">2014-12-01</time>
    <span property="orderNumber">123ABC</span>
    <div property="orderedItem" typeof="Product">
      <span property="name">ACME Furnace 3000</span>
      <meta property="productId" content="ABC123" />
    </div>
  </div>
  <div property="referencesOrder" typeof="Order">
    <span property="description">furnace installation</span>
    <time property="orderDate">2014-12-02</time>
    <div property="orderedItem" typeof="Service">
      <span property="description">furnace installation</span>
    </div>
  </div>
</div>

<script type="application/ld+json">
{
    "@context": "http://schema.org/",
    "@type": "Invoice",
    "broker": {
      "@type": "LocalBusiness",
      "name": "ACME Home Heating"
    },
    "accountId": "xxxx-xxxx-xxxx-1234",
    "customer": {
      "@type": "Person",
      "name": "Jane Doe"
    },
    "paymentDueDate": "2015-01-30",
    "minimumPaymentDue": {
      "@type": "PriceSpecification",
      "price": 0.00,
      "priceCurrency": "USD"
    },
    "totalPaymentDue": {
      "@type": "PriceSpecification",
      "price": 0.00,
      "priceCurrency": "USD"
    },
    "paymentStatus": "http://schema.org/PaymentComplete",
    "referencesOrder": [
      {
        "@type": "Order",
        "description": "furnace",
        "orderDate": "2014-12-01",
        "orderNumber": "123ABC",
        "paymentMethod": "http://purl.org/goodrelations/v1#ByInvoice",
        "orderedItem": {
          "@type": "Product",
          "name": "ACME Furnace 3000",
          "productId": "ABC123"
        }
      },
      {
        "@type": "Order",
        "description": "furnace installation",
        "orderDate": "2014-12-02",
        "paymentMethod": "http://purl.org/goodrelations/v1#ByInvoice",
        "orderedItem": {
          "@type": "Service",
          "description": "furnace installation"
        }
      }
    ]
}
</script>

An example of a credit card bill (invoice).
ACME Bank
Bill for: January 2015 Visa
invoice link: http://www.acmebank.com/invoice.pdf
Customer: Jane Doe
account ID: xxxx-xxxx-xxxx-1234
payment due: 2015-01-30
minimum payment: $15.00
total due: $200.00
billing period: 2014-12-21 to 2015-01-20
payment due

<div itemscope itemtype="http://schema.org/Invoice">
  <h1 itemprop="description">January 2015 Visa</h1>
  <a itemprop="url" href="http://acmebank.com/invoice.pdf" />Invoice PDF</a>
  <div itemprop="broker" itemscope itemtype="http://schema.org/BankOrCreditUnion">
    <b itemprop="name">ACME Bank</b>
  </div>
  <span itemprop="accountId">xxxx-xxxx-xxxx-1234</span>
  <div itemprop="customer" itemscope itemtype="http://schema.org/Person">
    <b itemprop="name">Jane Doe</b>
  </div>
  <time itemprop="paymentDueDate">2015-01-30</time>
  <div itemprop="minimumPaymentDue" itemscope itemtype="http://schema.org/PriceSpecification">
    <span itemprop="price">15.00</span>
    <span itemprop="priceCurrency">USD</span>
  </div>
  <div itemprop="totalPaymentDue" itemscope itemtype="http://schema.org/PriceSpecification">
    <span itemprop="price">200.00</span>
    <span itemprop="priceCurrency">USD</span>
  </div>
  <meta itemprop="billingPeriod" content="2014-12-21/P30D" />starts:2014-12-21 30 days
  <link itemprop="paymentStatus" href="http://schema.org/PaymentDue" />
</div>

<div vocab="http://schema.org/" typeof="Invoice">
  <h1 property="description">January 2015 Visa</h1>
  <a property="url" href="http://acmebank.com/invoice.pdf">Invoice PDF</a>
  <div property="broker" typeof="BankOrCreditUnion">
    <b property="name">ACME Bank</b>
  </div>
  <span property="accountId">xxxx-xxxx-xxxx-1234</span>
  <div property="customer" typeof="Person">
    <b property="name">Jane Doe</b>
  </div>
  <time property="paymentDueDate">2015-01-30</time>
  <div property="minimumPaymentDue" typeof="PriceSpecification">
    <span property="price">15.00</span>
    <span property="priceCurrency">USD</span>
  </div>
  <div property="totalPaymentDue" typeof="PriceSpecification">
    <span property="price">200.00</span>
    <span property="priceCurrency">USD</span>
  </div>
  <meta property="billingPeriod" content="2014-12-21/P30D" />starts:2014-12-21 30 days
  <link property="paymentStatus" href="PaymentDue" />
</div>

<script type="application/ld+json">
{
    "@context": "http://schema.org/",
    "@type": "Invoice",
    "description": "January 2015 Visa bill.",
    "url": "http://acmebank.com/invoice.pdf",
    "broker": {
      "@type": "BankOrCreditUnion",
      "name": "ACME Bank"
    },
    "accountId": "xxxx-xxxx-xxxx-1234",
    "customer": {
      "@type": "Person",
      "name": "Jane Doe"
    },
    "paymentDueDate": "2015-01-30",
    "minimumPaymentDue": {
      "@type": "PriceSpecification",
      "price": 15.00,
      "priceCurrency": "USD"
    },
    "totalPaymentDue": {
      "@type": "PriceSpecification",
      "price": 200.00,
      "priceCurrency": "USD"
    },
    "billingPeriod": "2014-12-21/P30D",
    "paymentStatus": "http://schema.org/PaymentDue"
}
</script>

Joes' Pizza
123 Main Street
Cambridge, MA 02142
delivers within 5 km of its store with a minimum order of $20.

<div itemscope itemtype="http://schema.org/FoodEstablishment">
  <span itemprop="name">Joe's Pizza</span>
  <div itemprop="location" itemscope itemtype="http://schema.org/PostalAddress">
    <span itemprop="streetAddress">123 Main Street</span>
    <span itemprop="addressLocality">Cambridge</span>
    <span itemprop="addressRegion">MA</span>
    <span itemprop="postalCode">02142</span>
  </div>
  delivers within 5 km of its store
  <div itemprop="makesOffer" itemscope itemtype="http://schema.org/Offer">
    <div itemprop="availableAtOrFrom" itemscope itemtype="http://schema.org/GeoCircle">
      <div itemprop="address" itemscope itemtype="http://schema.org/PostalAddress">
        <meta itemprop="streetAddress" content="123 Main Street" />
        <meta itemprop="addressLocality" content="Cambridge" />
        <meta itemprop="addressRegion" content="MA" />
        <meta itemprop="postalCode" content="02142" />
      </div>
      <meta itemprop="geoRadius" content="5000" />
    </div>
    with a minium order of $20.
    <div itemprop="priceSpecification" itemscope itemtype="http://schema.org/DeliveryChargeSpecification">
      <meta itemprop="appliesToDeliveryMethod" link="http://purl.org/goodrelations/v1#DeliveryModeOwnFleet">
      <div itemprop="eligibleTransactionVolume" itemscope itemtype="http://schema.org/PriceSpecification">
        <meta itemprop="price" content="20.00" />
        <meta itemprop="priceCurrency" content="USD" />
      </div>
    </div>
  </div>
</div>

<div vocab="http://schema.org/" typeof="FoodEstablishment">
  <span property="name">Joe's Pizza</span>
  <div property="location" typeof="PostalAddress">
    <span property="streetAddress">123 Main Street</span>
    <span property="addressLocality">Cambridge</span>
    <span property="addressRegion">MA</span>
    <span property="postalCode">02142</span>
  </div>
  delivers within 5 km of its store with a minium order of $20.
  <div property="makesOffer" typeof="Offer">
    <div property="priceSpecification" typeof="DeliveryChargeSpecification">
      <meta property="appliesToDeliveryMethod" link="http://purl.org/goodrelations/v1#DeliveryModeOwnFleet">
      <div property="eligibleTransactionVolume" typeof="PriceSpecification">
        <meta property="price" content="20.00" />
        <meta property="priceCurrency" content="USD" />
      </div>
      <div property="eligibleRegion" typeof="GeoCircle">
        <div property="address" typeof="PostalAddress">
          <meta property="streetAddress" content="123 Main Street" />
          <meta property="addressLocality" content="Cambridge" />
          <meta property="addressRegion" content="MA" />
          <meta property="postalCode" content="02142" />
        </div>
        <meta property="geoRadius" content="5000" />
      </div>
    </div>
  </div>
</div>

<script type="application/ld+json">
  {
    "@context": "http://schema.org/",
    "@type": "FoodEstablishment",
    "name": "Joe's Pizza",
    "location": {
      "@type": "PostalAddress",
      "@id": "http://example.com/address",
      "streetAddress": "123 Main Street",
      "addressLocality": "Cambridge",
      "addressRegion": "MA",
      "postalCode": "02142"
    },
    "makesOffer": {
      "@type": "Offer",
      "priceSpecification": {
        "@type": "DeliveryChargeSpecification",
        "appliesToDeliveryMethod": "http://purl.org/goodrelations/v1#DeliveryModeOwnFleet",
        "eligibleTransactionVolume": {
          "@type": "PriceSpecification",
          "price": "20.00",
          "priceCurrency": "USD"
        },
        "eligibleRegion": {
          "@type": "GeoCircle",
          "address": {
            "@id": "http://www.example.com/address"
          },
          "geoRadius": "5000"
        }
      }
    }
  }
</script>