Hi All,
1. Could someone provide Free POST and GET Urls for Integrations object and WEB API object which may accept documents as well?
2. How to give permission to third party via WB API to expose Appian data ( how to authenticate them or how to set up authentication for third party)?
3. What are the inputs required by third party to use APPIAN data (such as URL and credentials etc)?
4. Where the documents received in APPIAN via integrations saved in Appian?
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This is a pretty good list of free APIs that you can use for testing: https://github.com/public-apis/public-apis. If you want to call a Web API, I'd recommend using a tool like SoapUI or Postman. To your other questions on authentication and how the integrations work, I'd highly recommend looking at the Data Integrations page in the documentation - it should have the answers to all of your questions.