Sending payment notifications to Slack

Route Txn payment events straight into a Slack channel so your support team can act on them in real time — without watching the dashboard or building a backend.

You build a Slack Workflow that starts from a webhook and posts a formatted message to a channel. You then share that workflow's URL with Txn. From then on, Txn sends a notification to the channel whenever a relevant payment event occurs.

When this is useful

The notifications are most valuable for events your support team needs to reach out about proactively. For example:

• A payment arrives for an already-closed invoice. When an end user pays again against an invoice that is already settled, Txn allocates the received funds to your account in the payment currency (for example, USDT received is credited to your USDT account) and sends a notification so support can reconcile the extra payment with the customer.

• A payment is rejected on risk grounds. When a deposit is placed on hold due to high-risk exposure, then rejected and refunded to the source address, a notification lets support follow up with the end user instead of waiting for them to report a missing payment.

What you'll need

• A Slack workspace where you can create workflows in Workflow Builder.

• A channel for the notifications — for example, a private customer-support channel.

Step 1 — Open Workflow Builder

In Slack, go to More → Tools ("Create and find workflows and apps") and create a new workflow. Give it a recognizable name such as Txn Payment Alerts.

Step 2 — Start the workflow from a webhook

Under Start the workflow…, choose an event, then select From a webhook ("Starts from a third-party event"). This makes the workflow run whenever Txn sends a web request to it.

Slack generates the Web request URL only after you save the trigger, and anyone with that URL can trigger the workflow. Treat it as a secret — share it only with Txn.

Step 3 — Define the data variables

On the webhook trigger, open Set Up Variables and add one variable for each field Txn sends in the notification payload. For every variable, set the Data type to Text.

Txn sends a flat JSON payload. Create a variable for each key:

{
  "network_name": "Example text",
  "transaction_type": "Example text",
  "tx_hash": "Example text",
  "description": "Example text",
  "address": "Example text",
  "reference": "Example text",
  "company_name": "Example text",
  "amount": "Example text"
}

Variable key	Data type	Description
network_name	Text	The network the transaction settled on, e.g. Tron (TRC20).
transaction_type	Text	The type of transaction (for example, a deposit).
tx_hash	Text	The on-chain transaction hash.
description	Text	Human-readable summary of what happened.
address	Text	The relevant wallet address (for example, the source address).
reference	Text	Your reference for the related invoice, payout, or channel.
company_name	Text	Your merchant account name.
amount	Text	The transaction amount, including currency.

Step 4 — Add a "Send a message to a channel" step

Under Then, do these things, add a step, open Messages, and choose Send a message to a channel.

Select the destination channel (for example, customer-support). Then build the message: type each label, and use Insert a variable to drop in the matching webhook variable next to it.

A message template that maps every variable to a labelled line:

Description: {description}
Merchant: {company_name}
Transaction Type: {transaction_type}
Merchant Reference: {reference}
Transaction Hash: {tx_hash}
Amount: {amount}
Address: {address}
Network: {network_name}

Save the step. Your workflow now starts from the webhook and posts to the channel.

Step 5 — Publish

Select Finish Up, confirm the workflow's name and permissions, and Publish.

After publishing, Slack confirms the workflow is live. You can optionally Add to Channel to surface it on the channel's Workflows tab.

Step 6 — Share the URL with Txn

Open the webhook trigger again and copy the Web request URL. Share it with your Txn implementation manager or Txn customer support, who will configure Txn to send notifications to it.

Once configured, Txn posts a message to your channel each time a relevant payment event occurs.