Terms of Use

1. What stackin is

stackin is a platform for businesses to issue electronic invoices (NF-e/NFS-e), through the web dashboard or the API. By creating an account, you agree to these terms.

2. Your account

You're responsible for keeping your password secure and for everything that happens under your account. One account can administer more than one company; each company can have more than one user linked to it.

3. Digital certificate

By uploading your company's digital certificate (.pfx), you authorize stackin to use it exclusively to sign the invoices you issue through the platform. The certificate is stored encrypted — see the Privacy Policy.

• You're responsible for keeping the certificate valid and the password correct.
• You can remove the certificate at any time — invoice issuance stops working until a new one is uploaded.

4. Responsibility for fiscal data

The data entered on invoices (recipient, items, amounts) is the issuer's responsibility. stackin transmits what was entered to the relevant tax authority — it doesn't validate the fiscal correctness of the issued content.

5. Service availability

We do our best to keep the service available, but we don't guarantee uninterrupted operation. Invoice issuance also depends on the availability of tax authority systems (SEFAZ, national NFS-e environment), which are outside our control.

6. Closing your account

You can close your account at any time on the My Account page. Already-issued invoices keep existing — they're permanent fiscal records required by law, even after the account is closed.

7. Changes to these terms

We may update these terms as the product evolves. Relevant changes will be communicated on the platform.