Top 20 NuGet invoice Packages

A *SIGNED* open source C# helper library for communication with the API of FactuurSturen.nl. It's a Portable Class Library (.NET 4.0, Windows Phone 8.1, Windows Phone Silverlight 8 and Windows 8.x).
Invoice Capture is an online debt management system that helps companies get paid faster. InvoiceCaptureLib is a .NET library to communicate with it's public API.
A C# client to access Billomat.
ApiGum SDK is a .Net library for managing integrations between popular cloud applications like Twilio, SendGrid, Shopify and others.
Invoiced is a sync .NET client, and a portable class library for the Invoiced API. (Official Library)
Mondido Payments SDK for .net
DokuExtractorCore.Model is the data model for DokuExtractorCore
Protocol to sign and verify invoices
轮子发票中心SDK(.Net Standard版本)
A UiPath library to call the Klippa OCR API using a UiPath Activity. The Klippa OCR API provides real-time document extraction using OCR and Machine Learning, just send us the document and we provide you with the document content in a structured way to automate your document workflow.
A simple PDF invoice generator for .NET.
An implementation of http://email-invoice-format.org/ for .NET
.NET client library for FEL web services (FEL.mx)
.NET client library for Servisim web services (www.servisim.com.mx)
.NET client library for FiscoClic web services (FiscoClic.mx)
Client for Mundipagg API
.NET client library for DFacture web services (dfacture.com)
Protocol to sign and verify invoices, data storage on IOTA Tangle
Baiwang Invoice SDK
An invoice generator. Accepts an XML file from a client that specifies the details about the job to be invoiced. Commercial version: XInvoices. Web and console interface. Available at fullcirclesolutions.com.au