Level 88
Well it completely depends on the size of your project. When you for example focus on cars it might be wise to have a complete directory focused on cars in your app directory.
For now I would recommend to create a directory called contracts and store them in there. While doing that you have two options as well. You can place this folder in app/Http/Controllers/Contracts or in app/Contracts. That's all up to you.
Since this is a controller specific interface I would place it in app/Http/Controllers/Contracts
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