Invoices and boletos
Your billing system creates the invoice or the boleto as a PDF, and we print it and post it to each customer every month. A boleto is the Brazilian payment slip that people pay at banks and in banking apps.
Automated physical mail in Brazil.
Connect your system to our API or upload mailings in bulk. We print, envelope and post them across Brazil.
New accounts get R$50 in credit, enough for 3 simple letters.
POST /v1/letters
{
"to": { "cep": "01001-000", ... },
"file": "fatura-outubro.pdf",
"color": true
}Leave the mail to us
Sending mail is not your core business. Connect CartaFlow to your system and we handle the printing, the envelopes and the trip to the post office in Brazil.
Connected to your system
Each mailing goes out when your system says so, without anyone on your team having to remember it.
Printing and envelopes on us
Paper, color or black-and-white printing and a good-quality envelope are handled by CartaFlow in Brazil.
Posting through Correios
We take everything to Correios, the Brazilian postal service, so your team never has to.
Followed in one place
In the dashboard or through the API, you see what has been printed and posted.
What you can send to Brazilian addresses
Businesses outside Brazil use CartaFlow for mail that has to reach customers and students in Brazil on paper.
Reminders and relationship mail
Appointment, service and renewal reminders, birthday and welcome letters for customers in Brazil, printed in color under your brand and written in Portuguese.
Collection notices
Payment reminders and formal notices, sent by your system when an account falls behind.
Condominium notices
Property managers send boletos, meeting calls and notices to every unit of a building.
Schools and universities
Tuition boletos, academic notices and documents for students and parents, sent to one class or to everyone at once.
Transactional mail
Each event in your system, such as an approved application or a contract change, can trigger a mailing.
See the APISend through the API or the dashboard
Use the API when your system should send mail on its own. Use the dashboard to send a batch without writing code.
API: automated mailings
When your system issues an invoice or records an event, it calls the API with the PDF and the address. The mailing goes into the print queue, and the API tells you when it was printed and posted.
curl https://api.cartaflow.com.br/v1/letters \
-H "Authorization: Bearer $CARTAFLOW_KEY" \
-F "to[cep]=01001-000" \
-F "color=true" \
-F "file=@invoice-october.pdf"Illustrative API example, subject to change before launch.
Brazil mail APIDashboard: bulk mailings
Upload many files and addresses at once. Before you confirm, you review the recipients and the total for the batch.
- One PDF per recipient, in the layout you designed
- Color or black-and-white printing
- Posted through Correios to any address in Brazil
CartaFlow and Correios e-Carta
e-Carta is the Correios service in which documents are sent electronically and Correios prints, envelopes and delivers them. CartaFlow also posts through Correios, and takes care of how your mail looks and how it is sent.
A well-finished envelope
Your mail arrives in a good-looking envelope that presents your brand well in the recipient’s hands.
Color printing
Logos, colors and images come out as you designed them. Black and white is also available.
Your PDF, your layout
You decide the layout, the text and the design. We print exactly the file you send.
API and dashboard together
Automate from your system or send a batch from the dashboard, at the same price per mailing.
Physical address verification
Confirm customer addresses with a mailing under your brand that carries a code and a QR code.
Printing and posting handled in Brazil
Your team needs no print shop, supplies or staff in Brazil to get mail out.
CartaFlow is an independent company with no ties to Correios. e-Carta is a Correios service.
Physical address verification
Anyone can type an address into a sign-up form. A code mailed to that address confirms that someone there receives the mail.
Illustrative example. The mailing is written in Portuguese for the recipient in Brazil and carries your logo, not CartaFlow's.
We mail a code and a QR code to the address, under your brand. The person scans the QR code with a phone or types the code, and the address is marked as verified.
Fintechs and banks with Brazilian customers use it when opening accounts and approving credit. Marketplaces and platforms use it to block sign-ups with fake addresses and to stop relying on photos of utility bills.
Three ways to use it
In the dashboard, with no code
Add the address in the dashboard and see when it was verified, with the date, IP and device of the confirmation.
A verification page under your brand
The QR code opens a page with your logo and the code filled in, hosted by CartaFlow. The person taps once to confirm.
Through the API, inside your app
The person enters the code in your app and your system checks it with our API.
Each verification costs the same as one mailing on your plan.
How verification worksBrazilian mail in four terms
The details teams abroad ask about first. CartaFlow handles the printing and posting in Brazil; these help you prepare the files and the addresses.
- CEP
- The Brazilian postal code: eight digits, written as 00000-000. Every address has one.
- Correios
- The national postal service of Brazil. Domestic mail travels through Correios after we post it.
- Boleto
- A Brazilian payment slip with a barcode, paid at banks, lottery outlets and banking apps.
- CNPJ and CPF
- The registration numbers of Brazilian companies (CNPJ) and individuals (CPF), often printed on invoices.
How a mailing is sent
You send the file and the address. Printing, enveloping and posting happen in Brazil.
Send the PDF and address
From your system through the API, or many at once in the dashboard.
We print it
In color or black and white, exactly as your file looks.
We envelope it
Each mailing goes into an envelope addressed to its recipient.
We post it
Posted through Correios to any address in Brazil.
What it costs
You pay per mailing, from R$5.90 in Brazilian reais. Pay as you go has no monthly fee. On the other plans, a monthly fee lowers the price of every mailing, and annual billing gives 2 months free.
What each mailing costs
- Pay as you gofrom R$15.90 per mailing
Cheapest for up to 24 mailings a month. No monthly fee.
- Essentialfrom R$9.90 per mailing
Cheapest for 25 to 256 mailings a month. R$124 monthly fee on annual billing.
- Professionalfrom R$7.40 per mailing
Cheapest for 257 to 1,466 mailings a month. R$658 monthly fee on annual billing.
- Scalefrom R$5.90 per mailing
Cheapest for 1,467 or more mailings a month. R$2,490 monthly fee on annual billing.
Annual billing gives 2 months free of the monthly fee.
New accounts get R$50 in credit, enough for 3 simple letters.
Questions
More answers in the FAQ.
How does automated mail in Brazil work?
Your system sends a PDF and a Brazilian address to the CartaFlow API. We print the document, put it in an envelope and post it through Correios. If you prefer not to integrate, you upload the files in the dashboard.
Who can open an account?
CartaFlow accounts are for registered businesses. Requirements for businesses outside Brazil are confirmed during sign-up.
Can the mail be printed in color?
Yes. You choose color or black and white. CartaFlow prints the PDF exactly as you send it, so the layout, colors and logo are the ones you designed.
What language should the mail be in?
Your recipients live in Brazil, so most businesses write their mail in Portuguese. CartaFlow does not translate or edit your content.
How is CartaFlow different from Correios e-Carta?
e-Carta is the Correios service in which documents are sent electronically and Correios prints, envelopes and delivers them. CartaFlow also posts through Correios and adds a better envelope, color printing, your own PDF layout, an API, a dashboard and physical address verification.
How long does delivery take?
Delivery time depends on the postal service and the destination within Brazil, and it is not guaranteed by CartaFlow.
Is CartaFlow part of Correios?
No. Correios is the national postal service of Brazil. CartaFlow is an independent company that prints and envelopes your mail and posts it through Correios.
Send your first letter free.
New accounts get R$50 in credit, enough for 3 simple letters.