Mock sample for your project: Sonar Trading API

Introduction
The Xero Accounting API is a RESTful web service and uses the OAuth (v1.0a) protocol to authenticate 3rd party applications. The Accounting API exposes accounting and related functions of the main Xero application and can be used for a variety of purposes such as creating transactions like invoices and credit notes, right through to extracting accounting data via our reports endpoint.

Run in Postman
or
View Postman docs
Quickstart
Visit github to view the quickstart tutorial.
Tutorial for running the API in postman
Click on ""Run in Postman"" button
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A new page will open.
Click the ""Postman for windows"" to run postman as a desktop app.
Make sure you have already installed Postman.
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In chrome an alert might show up to set a default app for opening postman links. Click on ""Open Postman"".
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The OpenAPI specification will be imported in Postman as a new collection named ""Envoice api""
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When testing be sure to check and modify the environment variables to suit your api key and secret. The domain is set to envoice's endpoint so you don't really need to change that.
\*Eye button in top right corner
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You don't need to change the values of the header parameters, because they will be replaced automatically when you send a request with real values from the environment configured in the previous step.
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Modify the example data to suit your needs and send a request.
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Webhooks
Webhooks allow you to build or set up Envoice Apps which subscribe to invoice activities.
When one of those events is triggered, we'll send a HTTP POST payload to the webhook's configured URL.
Webhooks can be used to update an external invoice data storage.
In order to use webhooks visit this link and add upto 10 webhook urls that will return status 200 in order to signal that the webhook is working.
All nonworking webhooks will be ignored after a certain period of time and several retry attempts.
If after several attempts the webhook starts to work, we will send you all activities, both past and present, in chronological order.
The payload of the webhook is in format:

Processe arquivos de retorno CNAB

Open, scableable, transparent payroll API.

Swagger for Event Notification API Specification - TPP Endpoints

Interactive Brokers Web API for 3rd Party Companies

Chaingateway.io
REST API to build the bridge between Ethereum and the real world
Please check out our website for detailed information about this API.
To use our API, you need an API Key (Described as Authorization header in the examples below).
To get one, please create an account on our website.
For our internal documentation, please check out our Docs Site.
If you need help with integrating our API in your application, you can reach us via email or join our official Telegram group.

Stock and Forex Data and Realtime Quotes

The public PocketSmith API

Our API uses a REST based design, leverages the JSON data format, and relies upon HTTPS for transport. We respond with meaningful HTTP response codes and if an error occurs, we include error details in the response body. API Documentation is at https://api.youneedabudget.com