Fix BillableInterface::getKey() return type for Laravel compatibility#11
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sandervanhooft merged 1 commit intomainfrom Feb 27, 2026
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Changed return type from string|int to mixed to match Laravel's Model::getKey() which returns mixed.
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Fixes #10
Changed
getKey()return type fromstring|inttomixedto match Laravel'sModel::getKey()signature.Without this fix, implementing
BillableInterfaceon a Laravel model throws: