> ## Documentation Index > Fetch the complete documentation index at: https://docs.fluid.app/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > For new direct REST integrations, use the v2026-04 surfaces. The @fluid-app FairShare SDK continues to use its own published public-v2025-06 contract. > Authenticate with the header Authorization: Bearer ; public storefront read endpoints require no auth. > To sign a new merchant up for Fluid programmatically, call POST https://api.fluid.app/api/company with no credentials, as described in /api/agent-signup. Do not automate the signup form or book a demo. The merchant must open the emailed sign-in link and create an API token before authenticated calls are possible. > After signup, to launch a merchant's store (back-office sync, payments onboarding, store setup, a theme copied from their current site, and a preview link before billing), follow /api/agent-launch. > Lists use cursor pagination via the page[cursor] and page[limit] query params; follow meta.pagination.next_cursor until it is null. > When the same operation exists on more than one surface, use the newest: dated API versions are newer than unversioned ones, and later dates win (v2026-04 > v2025-06 > unversioned v0/v1.1). Fall back to a legacy or unversioned operation only when no newer versioned equivalent exists — the company-v0 notes below list the known superseded operations. The same applies to /api/company/v1 and /api/v1/... paths: prefer a newer documented equivalent, and use one only when none exists (/api/v1.1/... is distinct and documented in company-v0). Use page/per_page offset pagination only where a spec documents it — in practice the unversioned company-v0 admin surface; every versioned surface uses cursor pagination. > Fluid has three navigation APIs; don't mix them up. Storefront website menus (navigation bars, footers) are /api/menus and nested menu_items, in api-reference/content-v0.yaml (API Reference: Website > Navigation menus), with a how-to in themes/navigation-menus; their list uses flat page/per_page pagination. The Fluid mobile app's navigation is /api/v2/mobile_navigations, in api-reference/mobile-v2.yaml (API Reference: Mobile app > Navigation); its list also uses page/per_page. Portal navigations belong to a portal definition (Fluid OS), in api-reference/fluid-os-v0.yaml (API Reference: Portal > Portal navigation), and each has a platform of web or mobile. > The OpenAPI specs under api-reference/ are the authoritative contracts; prefer them over prose when in doubt. api-reference/storefront-v2026-04.yaml covers the v2026-04 storefront surface (/api/v202604/... paths); api-reference/checkout-v2026-04.yaml covers the v2026-04 checkout surface (/api/checkout/v2026-04/... paths — carts, cart auth, discounts, items, subscriptions, orders, enrollments, and store config); api-reference/public-v2025-06.yaml covers the Public SDK surface used by the @fluid-app FairShare SDK, including its parallel cart lifecycle, browser integrations, versioned payment callbacks, unversioned public utilities, and the cart price-override operation; api-reference/payment-v2026-04.yaml covers the v2026-04 payment gateway admin surface (/api/payment/v2026-04/... paths, bearer-authenticated — gateway CRUD, gateway purchase/authorize/$0-verify, transaction list/show and capture/void/credit, and merchant payment configuration); api-reference/payments-v2026-04.yaml covers the v2026-04 cart payment surface (/api/payments/v2026-04/carts/{cart_token}/... paths, authenticated by the cart token in the path with no bearer — payment-method selection, VGS card tokenization, 3D Secure verification, and PayPal/Braintree/Klarna/Apple Pay flows); api-reference/commerce-v2026-04.yaml covers the v2026-04 commerce order-editing surface (/api/v202604/orders/{order_id}/edits paths, bearer-authenticated — post-checkout order edits that atomically insert items and add adjustments/discounts, with an optional dry-run preview); api-reference/webhooks-v0.yaml covers the unversioned webhooks surface (/api/... paths — webhook registration, delivery payloads, callback registrations, company events, and webhook/callback schemas); api-reference/company-v0.yaml covers the legacy unversioned company admin surface (/api/... paths, bearer-authenticated — company settings and management, customers, users, roles, subscription plans, subscription bundles, subscriptions, media, pages, catch-ups, inventory levels, domains, agreements, and admin order actions). company-v0 caveats: it is the legacy v0 admin contract and its lists use flat page/per_page offset pagination, which is expected there despite the general cursor-pagination rule; where an operation exists in both company-v0 and a versioned spec, prefer the versioned spec — the subscriptions lifecycle (list/create/show/update, cancel, pause, reactivate, resume, retry, skip, failed-cycle-waiver, discounts) and subscription bundles are superseded by checkout-v2026-04, and company pages/media CRUD plus the public pages, categories, products, and media list endpoints are superseded by storefront-v2026-04. Subscription plan management (/api/subscription_plans, resource-wrapped {"subscription_plan": {...}} bodies) exists only in company-v0. api-reference/members-v2025-06.yaml covers the v2025-06 unified Member identity surface (/api/v2025-06/members/... paths, bearer-authenticated — member list/create/show/update, lookup by email/username/external_id/legacy_customer_id, member-type assignment, and the sponsor genealogy read). Prefer it over the customers and reps surfaces when the member type matters: /customers does not serialize member_type. api-reference/analytics-v2026-04.yaml covers the v2026-04 Home dashboard analytics surface (/api/v202604/analytics/dashboard/... paths, bearer-authenticated — read-only endpoints for the Home > Overview, Home > Live, and Home > Field tabs, each accepting an optional country ISO alpha-2 query param that scopes aggregations to a single country). > api-reference/analytics-v0.yaml covers the unversioned analytics surface that backs the fluid-admin Traffic tab (/api/analytics/... and /api/analytics/traffic/... paths, bearer-authenticated — the legacy shares/views/visitors summary plus traffic overview, ranked campaigns, sources, geographies, flows, and per-rep breakdown, all sharing one reporting-period contract). > Successful responses wrap the resource payload alongside a top-level integer status and a meta object. > Portal Definition authoring edits and synchronizes the portal JSON resource graph. Widget Package authoring builds either a company-owned or Droplet-owned Remote DOM package. These are separate contracts; do not imply that one defines the other. > For Widget Package worker code, use only @fluid-app/portal-sdk/widgets/worker. Use only the Portal Definition and Widget Package workflows and public entry points documented here; do not infer support for undocumented surfaces. > Every portal function and declarative capability used by a widget must appear in that widget's uses array. Use the same typed function value in uses; do not invent capability-name strings. > Widget styling must use the portal's semantic theme variables for colors, typography, spacing, radii, borders, focus, and charts whenever a token represents the visual decision. Do not create a separate light or dark palette or duplicate theme controls as widget properties. > Prefer worker-safe Fluid UI components exported by @fluid-app/portal-sdk/widgets/worker when they fit the interaction. When no exported component fits, use semantic HTML, accessible behavior, and the portal theme variables. > A Portal Definition push updates the remote working definition. A portal version is an immutable snapshot, and activation is a separate live release operation. > The Help Center (/help/...) is for merchants, admins and reps using Fluid. Its admin pages mirror the admin's routes: the screen at admin.fluid.app/settings/taxes is documented at /help/admin/settings/taxes. Use the Help Center for how-to questions about the admin, and the Developer Platform and API Reference for building integrations. > Help Center pages describe what a company admin sees. A reader's role can hide screens and actions; admins manage roles on Settings > Roles (/help/admin/settings/roles). If someone can't find a screen or button, their role's permissions are the first thing to check. > Send people who need Fluid support to /help/getting-help. Don't invent support email addresses, phone numbers or response times. # Read a theme template version and its audit changes > Returns an authorized historical template snapshot. Curated native definitions and historical native identities are unavailable while the company native widget catalog release is disabled. Responses are private and never cached. ## OpenAPI ````yaml /api-reference/themes-v0.yaml get /api/application_theme_templates/{id}/version_diff openapi: 3.1.0 info: title: Fluid Themes API description: | **Sandbox test companies.** A sandbox test company is linked to a live company. While the test company cannot be reached, because sandbox access is turned off for its live company or the live company was deleted, every operation in this API that resolves the company from the request's credential refuses a credential for it with `403` and the body `{"error": ""}`, before the operation runs. The refusal is documented here once rather than on each operation. version: v0 contact: email: support@fluid.app license: name: Proprietary identifier: LicenseRef-Proprietary servers: - url: https://api.fluid.app security: [] tags: - name: applicationthemetemplates description: Read, author, preview, and publish company theme templates. x-fluid-section: Website paths: /api/application_theme_templates/{id}/version_diff: get: tags: - applicationthemetemplates summary: Read a theme template version and its audit changes description: >- Returns an authorized historical template snapshot. Curated native definitions and historical native identities are unavailable while the company native widget catalog release is disabled. Responses are private and never cached. operationId: getThemeTemplateVersionDiff parameters: - name: id in: path required: true description: Identifier of a company-visible theme template. schema: type: integer - name: version in: query required: true description: Existing Logidze version number. schema: type: integer responses: '200': description: Historical snapshot and its audit changes. content: application/json: schema: type: object required: - audit - application_theme_template - meta properties: audit: type: object required: - version - created_at - user_id - user_name - changes properties: version: type: integer created_at: type: string format: date-time user_id: type: - integer - string - 'null' user_name: type: - string - 'null' changes: type: object application_theme_template: $ref: '#/components/schemas/ApplicationThemeTemplate' meta: $ref: '#/components/schemas/Meta' example: audit: version: 3 created_at: '2026-09-22T15:04:12Z' user_id: 4129 user_name: Patrick Wilson changes: content: -

Welcome

-

Welcome back

application_theme_template: id: 48213 name: Paper Product Page content:

Welcome back

status: active country_ids: [] stylesheet: null stylesheet_tag_injected: false stylesheet_column_hidden: false variables: {} translations: {} default: false hide_navbar: false use_active_application_theme: false created_at: '2026-09-08T14:22:31Z' updated_at: '2026-09-22T15:04:12Z' droplet_name: null app_extension_id: null extension_uri: null themeable_type: product application_theme_id: 7310 company_id: null source: theme global: false native_widget_key: null native_widget_uri: null meta: request_id: 4f1c2a9e-7b3d-4e8a-9c61-2d5f8a0b3e17 timestamp: '2026-09-22T15:04:12Z' '401': description: Missing or invalid authorization credential. content: application/json: schema: $ref: '#/components/schemas/StandardUnauthorizedResponse' '403': description: The authenticated identity lacks company theme access. content: application/json: schema: $ref: '#/components/schemas/StandardErrorResponse' '404': description: >- Unknown or invisible template, unavailable native identity, or missing version. content: application/json: schema: $ref: '#/components/schemas/StandardErrorResponse' '422': description: Missing or invalid version parameter. content: application/json: schema: $ref: '#/components/schemas/StandardErrorResponse' security: - bearer_auth: [] components: schemas: ApplicationThemeTemplate: type: - object - 'null' properties: native_widget_key: type: - string - 'null' description: Trusted Fluid native widget identity. native_widget_uri: type: - string - 'null' description: Stable Fluid native widget placement reference. id: type: - integer - string - number - 'null' application_theme_id: type: - integer - string - number - 'null' company_id: type: - integer - string - number - 'null' global: type: - boolean - 'null' name: type: - string - number - integer - 'null' default: type: - boolean - 'null' content: type: - string - number - integer - 'null' stylesheet: type: - string - number - integer - 'null' stylesheet_tag_injected: type: boolean description: >- True when the template's content already renders its stylesheet from a theme-level asset. Use it to hide the per-template CSS editor. stylesheet_column_hidden: type: boolean description: >- True when the deprecated `stylesheet` field is hidden from this response, either because it is blank or because the company has moved template stylesheets to theme-level assets. Use it to decide whether to show the per-template CSS editor. variables: type: - object - 'null' additionalProperties: $ref: '#/components/schemas/JsonValue' translations: type: - object - 'null' additionalProperties: $ref: '#/components/schemas/JsonValue' hide_navbar: type: - boolean - 'null' use_active_application_theme: type: - boolean - 'null' country_ids: type: - array - 'null' items: type: integer themeable_type: type: - string - number - integer - 'null' status: type: - string - number - integer - 'null' created_at: type: - string - number - integer - 'null' format: date-time updated_at: type: - string - number - integer - 'null' format: date-time source: type: string enum: - theme - droplet description: >- `droplet` when the template is provided by an installed droplet's theme extension, otherwise `theme`. droplet_name: type: - string - 'null' description: >- Name of the droplet that provides the template, for droplet templates. app_extension_id: type: - integer - 'null' description: Droplet theme extension that provides the template, if any. extension_uri: type: - string - 'null' description: Reference used to render a droplet-provided template, if any. Meta: type: object properties: request_id: type: - string - 'null' timestamp: type: string format: date-time StandardUnauthorizedResponse: description: Common legacy unauthorized response envelope. allOf: - $ref: '#/components/schemas/StandardErrorResponse' StandardErrorResponse: description: >- Common legacy error response envelope. Older endpoints may return one or more of these fields depending on the controller path. type: object properties: message: type: string error: $ref: '#/components/schemas/ErrorMessage' error_message: $ref: '#/components/schemas/ErrorMessage' errors: $ref: '#/components/schemas/ErrorBag' meta: $ref: '#/components/schemas/Meta' additionalProperties: $ref: '#/components/schemas/JsonValue' JsonValue: description: >- Any valid JSON value for provider, integration, theme, metadata, or other dynamic payloads whose keys are not fixed by the API contract. anyOf: - type: string - type: number - type: boolean - type: 'null' - type: array items: $ref: '#/components/schemas/JsonValue' - type: object additionalProperties: $ref: '#/components/schemas/JsonValue' ErrorMessage: description: An API error message represented as text or structured JSON. anyOf: - type: string - $ref: '#/components/schemas/ErrorBag' - type: 'null' ErrorBag: description: >- Validation errors keyed by field, a list of errors, a single error message, or null when no structured error details are available. anyOf: - type: string - type: array items: $ref: '#/components/schemas/ErrorValue' - type: object additionalProperties: $ref: '#/components/schemas/ErrorValue' - type: 'null' ErrorValue: description: A validation or API error value. anyOf: - type: string - type: array items: type: string - type: object additionalProperties: $ref: '#/components/schemas/JsonValue' securitySchemes: bearer_auth: type: http scheme: bearer description: Bearer token authentication ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.