The .NET OCR SDK supports the Invoice API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.
Invoice sample

Quick-Start

using Mindee;
using Mindee.Input;
using Mindee.Product.Invoice;

string apiKey = "my-api-key";
string filePath = "/path/to/the/file.ext";

// Construct a new client
MindeeClient mindeeClient = new MindeeClient(apiKey);

// Load an input source as a path string
// Other input types can be used, as mentioned in the docs
var inputSource = new LocalInputSource(filePath);

// Call the API and parse the input
var response = await mindeeClient
    .ParseAsync<InvoiceV4>(inputSource);

// Print a summary of all the predictions
System.Console.WriteLine(response.Document.ToString());

// Print only the document-level predictions
// System.Console.WriteLine(response.Document.Inference.Prediction.ToString());

You can also call this product asynchronously:

using Mindee;
using Mindee.Input;
using Mindee.Product.Invoice;

string apiKey = "my-api-key";
string filePath = "/path/to/the/file.ext";

// Construct a new client
MindeeClient mindeeClient = new MindeeClient(apiKey);

// Load an input source as a path string
// Other input types can be used, as mentioned in the docs
var inputSource = new LocalInputSource(filePath);

// Call the product asynchronously with auto-polling
var response = await mindeeClient
    .EnqueueAndParseAsync<InvoiceV4>(inputSource);

// Print a summary of all the predictions
System.Console.WriteLine(response.Document.ToString());

// Print only the document-level predictions
// System.Console.WriteLine(response.Document.Inference.Prediction.ToString());

Output (RST):

########
Document
########
:Mindee ID: 372d9d08-59d8-4e1c-9622-06648c1c238b
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/invoices v4.7
:Rotation applied: Yes

Prediction
==========
:Locale: en; en; CAD;
:Invoice Number: 14
:Reference Numbers: AD29094
:Purchase Date: 2018-09-25
:Due Date:
:Total Net: 2145.00
:Total Amount: 2608.20
:Total Tax: 193.20
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  |               |        | 8.00     | 193.20        |
  +---------------+--------+----------+---------------+
:Supplier Payment Details:
:Supplier Name: TURNPIKE DESIGNS
:Supplier Company Registrations:
:Supplier Address: 156 University Ave, Toronto ON, Canada, M5H 2H7
:Supplier Phone Number: 4165551212
:Supplier Website:
:Supplier Email: [email protected]
:Customer Name: JIRO DOI
:Customer Company Registrations:
:Customer Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Customer ID:
:Shipping Address:
:Billing Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Document Type: INVOICE
:Line Items:
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Description                          | Product code | Quantity | Tax Amount | Tax Rate (%) | Total Amount | Unit of measure | Unit Price |
  +======================================+==============+==========+============+==============+==============+=================+============+
  | Platinum web hosting package Down... |              | 1.00     |            |              | 65.00        |                 | 65.00      |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | 2 page website design Includes ba... |              | 3.00     |            |              | 2100.00      |                 | 2100.00    |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Mobile designs Includes responsiv... |              | 1.00     |            |              | 250.00       | 1               | 250.00     |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+

Page Predictions
================

Page 0
------
:Locale: en; en; CAD;
:Invoice Number: 14
:Reference Numbers: AD29094
:Purchase Date: 2018-09-25
:Due Date:
:Total Net: 2145.00
:Total Amount: 2608.20
:Total Tax: 193.20
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  |               |        | 8.00     | 193.20        |
  +---------------+--------+----------+---------------+
:Supplier Payment Details:
:Supplier Name: TURNPIKE DESIGNS
:Supplier Company Registrations:
:Supplier Address: 156 University Ave, Toronto ON, Canada, M5H 2H7
:Supplier Phone Number: 4165551212
:Supplier Website:
:Supplier Email: [email protected]
:Customer Name: JIRO DOI
:Customer Company Registrations:
:Customer Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Customer ID:
:Shipping Address:
:Billing Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Document Type: INVOICE
:Line Items:
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Description                          | Product code | Quantity | Tax Amount | Tax Rate (%) | Total Amount | Unit of measure | Unit Price |
  +======================================+==============+==========+============+==============+==============+=================+============+
  | Platinum web hosting package Down... |              | 1.00     |            |              | 65.00        |                 | 65.00      |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | 2 page website design Includes ba... |              | 3.00     |            |              | 2100.00      |                 | 2100.00    |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Mobile designs Includes responsiv... |              | 1.00     |            |              | 250.00       | 1               | 250.00     |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+

Field Types

Standard Fields

These fields are generic and used in several products.

BaseField

Each prediction object contains a set of fields that inherit from the generic BaseField class.
A typical BaseField object will have the following attributes:

Confidence (double?): the confidence score of the field prediction.
BoundingBox (BoundingBox): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
Polygon (Polygon): contains the relative vertices coordinates (Polygon extends List<Point>) of a polygon containing the field in the image.
PageId (int?): the ID of the page, always null when at document-level.

Note: A Point simply refers to a List of double.

Aside from the previous attributes, all basic fields have access to a custom ToString method that can be used to print their value as a string.

AmountField

An amount field AmountField extends BaseField, but also implements:

Value (double?): corresponds to the field value. Can be null if no value was extracted.

ClassificationField

The classification field ClassificationField extends BaseField, but also implements:

Value (strong): corresponds to the field value.

Note: a classification field's value is always a string`.

CompanyRegistration

Aside from the basic BaseField attributes, the company registration field CompanyRegistration also implements the following:

Type (string): the type of company.
Value (string): corresponds to the field value.
ToTableLine(): a method that formats the data to fit in a .rst display.

StringField

The text field StringField extends BaseField, but also implements:

Value (string): corresponds to the field value.
RawValue (string): corresponds to the raw value as it appears on the document.

DateField

The date field DateField extends StringField, but also implements:

DateObject (DateTime?): an accessible representation of the value as a C# object. Can be null.

Locale

The locale field Locale extends BaseField, but also implements:

Language (string): ISO 639-1 language code (e.g.: en for English). Can be null.
Country (string): ISO 3166-1 alpha-2 or ISO 3166-1 alpha-3 code for countries (e.g.: GRB or GB for "Great Britain"). Can be null.
Currency (string): ISO 4217 code for currencies (e.g.: USD for "US Dollars"). Can be null.

PaymentDetail

The payment details field PaymentDetail extends BaseField, but it also implements:

AccountNumber (string): number of an account, expressed as a string. Can be null.
Iban (string): International Bank Account Number. Can be null.
RoutingNumber (string): routing number of an account. Can be null.
Swift (string): the account holder's bank's SWIFT Business Identifier Code (BIC). Can be null.

Taxes

Tax

Aside from the basic BaseField attributes, the tax field Tax also implements the following:

Rate (double?): the tax rate applied to an item expressed as a percentage. Can be null.
Code (string): tax code (or equivalent, depending on the origin of the document).
Base (double): base amount used for the tax. Can be null.
Value (double): the value of the tax. Can be null.

Note: currently Tax is not used on its own, and is accessed through a parent Taxes object, a list-like structure.

Taxes (List)

The Taxes field represents a List of Tax objects. As it is the representation of several objects, it has access to a custom ToString method that can render a Tax object as a table line.

Specific Fields

Fields which are specific to this product; they are not used in any other product.

Line Items Field

List of line item details.

A InvoiceV4LineItem implements the following attributes:

Description (string): The item description.
ProductCode (string): The product code referring to the item.
Quantity (double): The item quantity
TaxAmount (double): The item tax amount.
TaxRate (double): The item tax rate in percentage.
TotalAmount (double): The item total amount.
UnitMeasure (string): The item unit of measure.
UnitPrice (double): The item unit price.

Attributes

The following fields are extracted for Invoice V4:

Billing Address

BillingAddress: The customer's address used for billing.

System.Console.WriteLine(result.Document.Inference.Prediction.BillingAddress.Value);

Customer Address

CustomerAddress: The address of the customer.

System.Console.WriteLine(result.Document.Inference.Prediction.CustomerAddress.Value);

Customer Company Registrations

CustomerCompanyRegistrations: List of company registrations associated to the customer.

foreach (var CustomerCompanyRegistrationsElem in result.Document.Inference.Prediction.CustomerCompanyRegistrations)
{
    System.Console.WriteLine(CustomerCompanyRegistrationsElem.Value);
}

Customer ID

CustomerId: The customer account number or identifier from the supplier.

System.Console.WriteLine(result.Document.Inference.Prediction.CustomerId.Value);

Customer Name

CustomerName: The name of the customer or client.

System.Console.WriteLine(result.Document.Inference.Prediction.CustomerName.Value);

Purchase Date

Date: The date the purchase was made.

System.Console.WriteLine(result.Document.Inference.Prediction.Date.Value);

Document Type

DocumentType: One of: 'INVOICE', 'CREDIT NOTE'.

Possible values include:

INVOICE
CREDIT NOTE

System.Console.WriteLine(result.Document.Inference.Prediction.DocumentType.Value);

Due Date

DueDate: The date on which the payment is due.

System.Console.WriteLine(result.Document.Inference.Prediction.DueDate.Value);

Invoice Number

InvoiceNumber: The invoice number or identifier.

System.Console.WriteLine(result.Document.Inference.Prediction.InvoiceNumber.Value);

Line Items

LineItems(List<InvoiceV4LineItem>): List of line item details.

foreach (var LineItemsElem in result.Document.Inference.Prediction.LineItems)
{
    System.Console.WriteLine(LineItemsElem.Value);
}

Locale

Locale: The locale detected on the document.

System.Console.WriteLine(result.Document.Inference.Prediction.Locale.Value);

Reference Numbers

ReferenceNumbers: List of Reference numbers, including PO number.

foreach (var ReferenceNumbersElem in result.Document.Inference.Prediction.ReferenceNumbers)
{
    System.Console.WriteLine(ReferenceNumbersElem.Value);
}

Shipping Address

ShippingAddress: Customer's delivery address.

System.Console.WriteLine(result.Document.Inference.Prediction.ShippingAddress.Value);

Supplier Address

SupplierAddress: The address of the supplier or merchant.

System.Console.WriteLine(result.Document.Inference.Prediction.SupplierAddress.Value);

Supplier Company Registrations

SupplierCompanyRegistrations: List of company registrations associated to the supplier.

foreach (var SupplierCompanyRegistrationsElem in result.Document.Inference.Prediction.SupplierCompanyRegistrations)
{
    System.Console.WriteLine(SupplierCompanyRegistrationsElem.Value);
}

Supplier Email

SupplierEmail: The email of the supplier or merchant.

System.Console.WriteLine(result.Document.Inference.Prediction.SupplierEmail.Value);

Supplier Name

SupplierName: The name of the supplier or merchant.

System.Console.WriteLine(result.Document.Inference.Prediction.SupplierName.Value);

Supplier Payment Details

SupplierPaymentDetails: List of payment details associated to the supplier.

foreach (var SupplierPaymentDetailsElem in result.Document.Inference.Prediction.SupplierPaymentDetails)
{
    System.Console.WriteLine(SupplierPaymentDetailsElem.Value);
}

Supplier Phone Number

SupplierPhoneNumber: The phone number of the supplier or merchant.

System.Console.WriteLine(result.Document.Inference.Prediction.SupplierPhoneNumber.Value);

Supplier Website

SupplierWebsite: The website URL of the supplier or merchant.

System.Console.WriteLine(result.Document.Inference.Prediction.SupplierWebsite.Value);

Taxes

Taxes: List of tax line details.

foreach (var TaxesElem in result.Document.Inference.Prediction.Taxes)
{
    System.Console.WriteLine(TaxesElem.Value);
}

Total Amount

TotalAmount: The total amount paid: includes taxes, tips, fees, and other charges.

System.Console.WriteLine(result.Document.Inference.Prediction.TotalAmount.Value);

Total Net

TotalNet: The net amount paid: does not include taxes, fees, and discounts.

System.Console.WriteLine(result.Document.Inference.Prediction.TotalNet.Value);

Total Tax

TotalTax: The total tax: includes all the taxes paid for this invoice.

System.Console.WriteLine(result.Document.Inference.Prediction.TotalTax.Value);

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