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The extension can also be installed with Composer as a local package.

The extension package should be placed in a dedicated, local directory: documentroot/packages.

Once this directory exists, update the installations composer.json and add this directory as a new repository:

{
    "repositories": [
        {
            "type": "path",
            "url": "packages/*"
        },
    ],
}

Then run composer require to the install the local extension typo3-maileon-integration with vendor xqueue:

composer req xqueue/typo3-maileon-integration:@dev

By executing this command, Composer locates xqueue/typo3-maileon-integration and then symlinks it to typo3conf/ext/typo3-maileon-integration