LagunaLife the end of the file must look like this:
"prefer-stable": true,
"repositories": [{"type": "composer", "url": "https://extiverse.com/composer/"}]
}
The file follows JSON formatting, which requires a comma at the end of each line except the last one. If you add the repositories key at the bottom, this means adding a comma on the line above. If you add it in the middle, this means adding a comma at the end of the new line.
You can use online tools to validate JSON if needed. But most will probably give the same kind of error that Composer shows. It tells you at what place of the file the issue is.
Let me know if you have any other issue 😃
