If you check the docs, it states the following: 'In HubSpot, serverless functions are stored in the developer file system, visible in the design manager. You can access and edit your serverless functions locally through the CLI.'
So you need to create your serverless functions locally and sync those to your HubSpot portal. The HubSpot CLI is quite easy to use. Check these docs to get started.
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HubSpot Serverless functions live inside a functions folder. This folder can be named anything, but must contain the suffix .functions. Files stored in this folder are not publicly accessible.
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