This application allows you to configure a custom sticker ednpoint for multiple users by implementing a very small integration manager. The alternative would be to use https://github.com/turt2live/matrix-dimension which is deprecated and a huge service.
To actually configure the sticker server use this https://github.com/maunium/stickerpicker
After configuring the service you can configure this as your integration manager either inside your homeserver or the Element installation using:
integrations_ui_url=https://example.com/
integrations_rest_url=https://example.com/api
You can also enable a filter to only serve your stickerpicker to a specific homeserver
Add this to your account data inside the m.widget
state using the developer tools
{
"integration-manager": {
"content": {
"type": "m.integration_manager",
"url": "http://127.0.0.1:8080/",
"data": {
"api_url": "http://127.0.0.1:8080/api"
}
},
"type": "m.widget"
}
}