Build the workflow up to “ready to send.”

Turn approved records into a finished document and a sending quote. Postedly gives an n8n workflow a clear handoff: the file and recipient are ready, the total is known, and a person can review the order before paying.

See the setup guide See example requests

Documented workflow · untested

Last tested
Not yet tested

n8n documents MCP OAuth credentials and multipart binary uploads. A complete Postedly workflow in n8n has not yet been verified; use a version that supports Streamable HTTP.

Client and environment
n8n MCP Client Tool or authenticated HTTP requests; documented integration design only.
Stages completed
No Postedly workflow stages verified in n8n. No tested downloadable workflow or prebuilt node is claimed.
Your remaining steps
Configure protected credentials, verify binary transfer and the quote, save references and pause for the authorized person to review and pay. Reconcile the same order before a retry.
Still unverified
The complete n8n workflow, credential refresh, review handoff, payment and fulfillment.

Use n8n with Postedly

  1. Connect the MCP client

    Use the MCP Client Tool with Postedly’s endpoint and OAuth2 credentials. Configure dynamic client registration and the exact HTTPS callback shown by your n8n instance.

    https://postedly.com/mcp/send

  2. Pass the binary document

    Use authenticated HTTP upload where the credential is available, or obtain a private uploadEndpoint from postedly_prepare_document. In HTTP Request, choose Form-Data and an n8n Binary File parameter named file.

  3. Pause for the review handoff

    Save the document and quote references. Route the private approval link to the authorized person through your chosen workflow, then check the existing order after checkout.

Give it a specific request

Prepare one approved customer letter

Keep document generation, quote preparation and the approval handoff as separate workflow stages.

Example request
Prepare a Postedly mailing quote for the approved PDF and recipient in this record. Return the review link for a person to approve; do not pay or send automatically.

Transfer your file

Send the actual binary property, not a JSON string containing its name. Authenticated uploads also specify the service. A prepared handoff already binds the service and accepts field file without another bearer token. Keep its short-lived URL private.

  • For a letter or fax, prepare a valid, unencrypted PDF no larger than 10 MiB (10,485,760 bytes). Review the saved PDF after exporting it from the draft.
  • For mail, have the recipient’s full US postal address and your US sender address ready. For fax, confirm the receiving US fax number and your US billing address. Check the selected service’s page and layout limits before quoting.
  • Review the final proof returned with the quote, including any added cover or postal layout. An upload preview alone does not establish that the final document is ready to send.
Letter requirements Fax requirements

Mail a check

n8n can prepare a paper check drawn on your own verified US checking account. The assistant never sees your account numbers and can’t sign or pay; those steps stay with you.

  1. Set up checks once, yourself

    Open Postedly’s check page in your browser, verify your email and connect your checking account. You’ll verify it with Plaid, confirm you can sign for it, set a bank passkey and save your signature.

    Set up checks

  2. Ask n8n for the check

    Give the payee’s exact name and US mailing address, the amount and an optional memo. Using Postedly’s check tools, n8n reads your ready accounts and drafts the check, which reserves its number and prepares a service-fee quote. Nothing is signed, charged or sent.

  3. Review, sign and pay

    Open the private review link it gives you. Check the full proof, confirm with your passkey, sign and pay the service fee. The check amount is paid from your account only when the payee deposits it.

  4. Follow the order

    n8n can read the order to see when the check is printed and mailed. Postedly can’t see when it clears; your bank shows that.

Example request
Mail a $250 check to Riverside Little League, 400 Park Rd, Dayton, OH 45402, from my checking account. Memo: Spring registration. Send me the link to review and sign it.

If n8n doesn’t show Postedly’s check tools, reconnect Postedly or refresh its tools, or write the check yourself on Postedly.

Your approval comes before the send

Prepare and quote nodes do not pay. The customer reviews the exact proof, recipient and total in the browser before Stripe Checkout. Build this pause explicitly; a schedule or workflow retry is not fresh purchase approval.

Cancellation and refund policy

Follow the existing order

Store the order ID and check it on later runs. Treat timeouts as uncertain outcomes, and reconcile status before retrying a payment or send operation.

Check an order on Postedly

Send directly on Postedly

You can use the finished document without connecting an assistant. Download the approved PDF, open Postedly, choose an available service and upload the file. Enter the destination and sender details, then review the final proof and full price before payment. You do not need your own printer or envelopes to mail a PDF through Postedly.

Open the sending form Follow a sending guide Check services and pricing

Before you start

  • Your n8n node version must support Postedly’s transport and OAuth flow. Uploads are limited to 10 MiB. Serialize OAuth refresh for shared credentials and protect private file links. This guide does not promise unattended payment or a prebuilt Postedly node.

Official references

Use these platform references alongside the Postedly guide.

Ready to prepare a send?

Use the connected assistant, or finish directly with Postedly.

Read the API guide