With XML/JSON

An Administrator user can authenticate as follows. This generated token then needs to be passed in any API function that you execute. To see how to pass the token, refer here.

http://yourservername:portnumber/psa/api.do?function=login&username=username&password=password&company-code=company code

For example:
http://acmeindia:8888/psa/api.do?function=login&username=janet&password=diamond45&company-code=acme_com

If data format is XML and your authentication is successful, you will receive XML with two elements: token and user_id. For example:

<result>
   <token>a1dc42fb-d420-10feb-aaks9-89f5c0e8sk3c</token>
   <user_id>112233</user_id>
</result>

In case the data format is JSON, you will receive an object with properties token and user_id respectively.

{"result":{"token":"a1dc42fb-d420-10feb-aaks9-89f5c0e8sk3c","user_id":112233}}

On how to handle errors, see  Error Handling and Debugging