Composer plugin doesn't load / work :/

[zenopopovici]

Here's the error

# composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 8 installs, 0 updates, 0 removals
  - Installing advanced-custom-fields/advanced-custom-fields-pro (5.8.4): Downloading (failed)       
                                                                                                                 
  [Composer\Downloader\TransportException]                                                                       
  The "https://connect.advancedcustomfields.com/index.php?p=pro&a=download&k={%PLUGIN_ACF_KEY}&t={%version}" fi  
  le could not be downloaded (HTTP/1.1 404 Not Found)                                                            
                                                                                                                 

install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--no-suggest] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--ignore-platform-reqs] [--] [<packages>]...

composer.json

{
  "name": "xxx",
  "type": "project",
  "repositories": [{
      "type": "composer",
      "url": "https://wpackagist.org"
    },
    {
      "type": "package",
      "package": {
        "name": "advanced-custom-fields/advanced-custom-fields-pro",
        "version": "5.8.4",
        "type": "wordpress-plugin",
        "dist": {
          "type": "zip",
          "url": "https://connect.advancedcustomfields.com/index.php?p=pro&a=download&k={%PLUGIN_ACF_KEY}&t={%version}"
        }
      },
      "require": {
        "composer/installers": "^1.4",
        "ffraenz/private-composer-installer": "^2.0"
      }
    }
  ],
  "config": {
    "vendor-dir": "composer/vendor"
  },
  "require": {
    "johnpbloch/wordpress-core-installer": ">=1.0.2",
    "johnpbloch/wordpress": ">=5.2.3",
    "vlucas/phpdotenv": "^3.5",
    "advanced-custom-fields/advanced-custom-fields-pro": "^5.8"
  }
  "require-dev": {
    "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
    "wp-coding-standards/wpcs": "^2.1",
    "squizlabs/php_codesniffer": "^3.4",
    "phpcompatibility/phpcompatibility-wp": "^2.1",
    "composer/installers": "~1.0"
  }
}

[ffraenz]

Hi @zenopopovici, I just reviewed your composer.json. Make sure the require field is set on the package object. At the moment it is set on the repository object and thus this installer does not kick into action leaving the placeholders untouched. I hope this solves your issue.

[zenopopovici]

Yes, that's it. Sorry for the trouble, great work!