> For the complete documentation index, see [llms.txt](https://specs.govstack.global/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://specs.govstack.global/service-patterns/2.-functional-patterns.md). # 2. Functional patterns Functional patterns define what a service can do, its user-focused capability. They are built from multiple steps and can be combined to form a service. A service may include several functional patterns. Functional patterns mostly follow GovStack building blocks, but some blocks are used across multiple patterns. For example, the wallet block appears in ‘Get credential’, ‘Prove credential’, and ‘Manage credential.

		Cover image
Find a service	Find a service	Find a service.png
Guide users through a service	Guide users through a service	Guide users through a service.png
Other ways to access a service	Other ways to access a service	ChatGPT Image Feb 26 2026 from GovStack.png
Ask for consent	Ask for consent	Ask for consent.png
Authenticate	Authenticate	Authenticate.png
Check eligibility	Check eligibility	Check eligibility manually.png
Get a credential	Get a credential	Get a credential.png
Manage a credential	Manage a credential	Manage a credential.png
Present a credential	Present a credential	Present a credential.png
Make a payment	Make a payment	Make a payment.png
Schedule an appointment	Schedule an appointment	Schedule an appointment.png
Provide a signature	Provide a signature	Provide a signature.png

--- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://specs.govstack.global/service-patterns/2.-functional-patterns.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.