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You can either code a standalone PHP page as you would normally, or if you want to integrate with Nameless you will have to create a custom module.
We have some documentation on module development here: https://docs.namelessmc.com/en/module-documentation
If you have any specific questions please feel free to ask.
Can you please contact the Lithium template author for support - we do not support third party templates in this forum unfortunately.
There is a support Discord for the Lithium template here: https://coldfiredzn.com/discord
Please check the file cache/logs/fatal-log.log for more information.
You will need to find the web server error logs for more info - if you are using a web host, they should be able to help you find them.
The following is taken from our Discord support bot:
Plugin or Nameless-Link times out while waiting for response
This error means the website hasn't sent a response to an API call in a reasonable amount of time and the connection was aborted. Some possible causes are listed below.