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It is common for an application to make use of external services like Stripe, Mailchimp, etc.. If you need secrets to access these services, use Google Cloud Secret Manager. Since contributors cannot access your secrets, I suggest using something like MSW to mock these services.
It takes extra effort to build an open source application with serverless technologies, but it is certainly doable. Although I only covered Firebase in this post, there are other tools that provide local emulation (e.g. LocalStack). If you're considering which platform to use, pick one with local emulation support or a Docker image.