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# Concepts

Solution for managing NF-e, CT-e, NFS-e, NFC-e and Tax Coupons, from the issuance by the supplier to the storage, automating processes and validations of integrity, status, tax, partners and integrating the physical and goods tax entry.

TaxDocs Monitor is a complete solution for managing and validating your Electronic Invoices (NF-e), Electronic Bill of Lading (CT-e) and Electronic Invoice for Services (NFS-e).

The application performs the search and management of XMLs of Electronic Invoices, Electronic Invoice for Services and Electronic Bill of Lading, including those from the past, automating processes that today are performed manually in most companies, minimizing tax risks and time dedicated, increasing productivity.

In real-time, it is possible to monitor all XMLs issued against the company and its cancellations at SEFAZ, in addition, to monitoring the operation and validation of processes in the system, such as the manifestation of the NF-e recipient, XML integrity verification, generation of the correction letter, tax validation, validation of the partner in the Federal Revenue and Sintegra, control of shipment and return of goods, integration of physical and tax receipt within the ERP, keeping 100% of the tax documents stored in a single place.

### Models possible to be integrated through APIs

**Model**

**Name**

**Type**

55

NF-e

Electronic invoice for goods

57

CT-e

Electronic Bill of lading

SV

NFS-e

Electronic invoice for services

65

NFC-e

Electronic invoice for consumer

[Previous](https://developer.avalara.com/tax-docs-en/errors/api_error_handling)

[Next](https://developer.avalara.com/tax-docs-en/user_experience/design_experience)

> **Note**
>
> Part of the **TaxDocs** integration guide. [Open the full "Concepts" milestone on Avalara](https://developer.avalara.com/tax-docs-en/concepts/) to see every page in this section.