# Selling crypto using Bank Transfer payment method, Automation Bot boilerplate A sample application that you can use as a boilerplate for writing bot that would automate selling crypto using Bank Transfer payment method. Use it at your own risk! ## Running App 1. Make sure that your API key has `Paxful API` product added 2. Update `.env` file and set the API secret 3. Deploy the app somewhere OR use `ngrok` (for ngrok howto see below). As a result you should have a publicly accessible URL. You will need to use it in step 7) below 5. Run `npm i` to install dependencies 6. Run `node app.js` to start the application 7. Create webhook for `trade.started`, `trade.paid`, `trade.chat_message_received` events (scroll to the bottom of [Direct access section](https://developers.paxful.com/dashboard/direct-access)). For target URL use one that you got in step 4), but append to it `/paxful/webhook` suffix. So if you had `https://example.com`, then when configuring webhooks you should use `https://example.com/paxful/webhook` 8. Create a sell offer on Paxful with Bank Transfer payment method, and then initiate a trade upon it from another account. Once a trade is started upon an offer, then this application will automatically detect it (thanks to webhooks you setup earlier) and then handles the trade process. In order to emulate a callback from your bank (when fiat transfer is received in your bank account), you need to issue a POST request to `/bank/transaction-arrived` with the following structure: ```json { "reference": "dfwWnKXpZtV", "amount": 123, "currency": "EUR" } ``` In real world implementation parameters are very likely to have different names. Whatever names the parameters have, the payload **must** include a reference that a buyer specified for the payment (in the example above - `reference`) - the application will use it to cross-reference and detect what trade this bank transfer is related to. ### Using ngrok The application by default will be listening on http://localhost:3000, so if you haven't changed the port, then once you have `ngrok` installed on your machine, you can run the following command to receive a publicly accessible URL that you can use for registering as a webhook target on paxful.com: ``` ngrok http 3000 ```# Tester