This API provides access to Flash's Bitcoin and Lightning Network payment services for the Caribbean region — accept and send Bitcoin, run mobile-money transactions, and build integrations on top of Flash accounts.

Everything the web and mobile Flash apps do is powered by this single GraphQL API, and it's available to you too.

Use the testing endpoint while you develop, then switch to production.

• Guides (this section) walk through the common flows: getting started, authentication, API keys, example queries and mutations, and error handling.
• The Queries, Mutations, Subscriptions, and Types sections are the full, always-current reference generated from the API's schema — every operation with its arguments, response type, and an example.

Most operations require authentication. There are two ways to authenticate:

• A user session token — obtained by logging a user in with their phone number (see Authentication ). Best for apps acting on behalf of a signed-in user.
• An API key — a long-lived, scoped credential for server-to-server integrations (see API Keys ). Best for automation.

You can explore the API interactively at the testing endpoint .

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