> ## 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or unversioned operation only when no newer versioned equivalent exists — the company-v0 notes below list the known superseded operations.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. # Remove a reaction > Removes the member's reaction, if any. Repeating it changes nothing. ## OpenAPI ````yaml /api-reference/member-messaging-v2026-10.yaml delete /api/member/v2026-10/messaging/messages/{id}/reactions openapi: 3.1.0 info: title: Fluid Member API v2026-10 — Messaging description: | The signed-in member's messaging. Every operation acts as the member the bearer credential speaks for; the member and their company come from the credential alone. Messaging follows the rule the legacy messaging API applies: a membership with a messaging identity whose member type is the rep type, a company admin who holds the messaging view permission, or a root admin. A company admin's own credential is not a member credential and receives 401, so in practice a rep's or a root admin's membership reaches messaging. A customer or preferred-customer membership receives 403 from every operation, even when its member type grants the rep-eligible capability. A member session JWT, the kind order and subscription email links carry, never authenticates a rep, so it also receives 403 from every operation. contact: email: support@fluid.app license: name: Proprietary identifier: LicenseRef-Proprietary version: 2026-10 servers: - url: https://api.fluid.app description: Production API server - url: https://api.fluid.test description: Local development server security: - MemberBearer: [] tags: - name: messaging description: The signed-in member's conversations, messages and realtime delivery. x-fluid-section: Messaging paths: /api/member/v2026-10/messaging/messages/{id}/reactions: parameters: - name: id in: path required: true description: Public id of a message the member can see. schema: type: string format: uuid delete: tags: - messaging summary: Remove a reaction description: | Removes the member's reaction, if any. Repeating it changes nothing. operationId: member_messaging_message_reactions_destroy responses: '200': description: The message after the change. content: application/json: schema: $ref: '#/components/schemas/MessageEnvelope' example: status: 200 data: id: 0199a1b2-c3d4-7e5f-8a9b-0c1d2e3f4a60 conversation_id: 0199a1b2-c3d4-7e5f-8a9b-0c1d2e3f4a5b sender: id: 01a08944-eff4-7a2a-be01-d699fa649966 kind: member name: Nathan Rivera avatar_url: null kind: message text: See you at the kickoff. event: null attachments: [] reply_to: null reactions: - emoji: 👍 count: 1 mine: false pinned: false seen_by_count: 3 client_message_id: 7f1c2b9e-launch sent_at: '2026-10-01T15:02:00Z' created_at: '2026-10-01T15:01:59Z' edited_at: null meta: request_uuid: 01a0f4fe-de00-75b3-8d8a-b74b0cde8b07 timestamp: '2026-10-01T15:04:05Z' '401': description: >- Missing credential, or a credential that is not a usable member credential. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '403': description: >- The credential is read-only, the membership cannot message, or the change is not allowed here. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '404': description: Nothing with this id is visible to the member. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' components: schemas: MessageEnvelope: type: object description: One message. required: - status - data - meta properties: status: type: integer data: $ref: '#/components/schemas/Message' meta: $ref: '#/components/schemas/ResponseMeta' ErrorEnvelope: type: object description: Standard error envelope. properties: status: type: integer description: HTTP status code (mirrors the response status line). error: type: object properties: message: type: string description: Human-readable error message. details: type: object additionalProperties: true required: - message - details meta: $ref: '#/components/schemas/ResponseMeta' required: - status - error - meta Message: type: object description: One message as the signed-in member sees it. additionalProperties: false required: - id - conversation_id - sender - kind - text - event - attachments - reply_to - reactions - pinned - seen_by_count - client_message_id - sent_at - created_at - edited_at properties: id: type: string format: uuid conversation_id: type: string format: uuid sender: oneOf: - $ref: '#/components/schemas/Identity' - type: 'null' description: Who sent it, or null for a sender that no longer exists. kind: type: string enum: - message - event description: >- A message someone wrote, or an event the conversation recorded, such as a person joining. text: type: string description: The message text; empty for an event. event: oneOf: - $ref: '#/components/schemas/MessageEvent' - type: 'null' description: What happened, for an event; null for a message. attachments: type: array description: Files attached to the message. items: $ref: '#/components/schemas/Attachment' reply_to: type: - object - 'null' description: The message this one replies to, unless it was deleted. additionalProperties: false required: - id - preview properties: id: type: string format: uuid preview: type: string description: Up to 140 characters of its text. reactions: type: array description: Reaction totals, and whether the member chose each. items: type: object additionalProperties: false required: - emoji - count - mine properties: emoji: type: string count: type: integer minimum: 1 mine: type: boolean pinned: type: boolean seen_by_count: type: integer minimum: 0 description: Participants who have seen it. client_message_id: type: - string - 'null' description: The id the sending client chose, when it sent one. sent_at: type: - string - 'null' format: date-time description: >- When it was delivered; null while the member's own message is still queued. created_at: type: string format: date-time edited_at: type: - string - 'null' format: date-time ResponseMeta: type: object description: Envelope metadata present on every response. properties: request_uuid: type: string format: uuid description: Server-generated UUIDv7 uniquely identifying this response. timestamp: type: string format: date-time description: ISO 8601 timestamp at which the server produced the response. required: - request_uuid - timestamp additionalProperties: true Identity: type: object description: >- A participant: a member, one of the member's contacts, or another kind of recipient such as a bot. additionalProperties: false required: - id - kind - name - avatar_url properties: id: type: string format: uuid description: >- The member's id, the contact's id, or the recipient's own id for other kinds. kind: type: string enum: - member - contact - other description: What `id` refers to. name: type: - string - 'null' description: First and last name. Email and phone are never shown in its place. avatar_url: type: - string - 'null' description: Avatar image, when there is one. MessageEvent: type: object description: What a conversation event recorded. additionalProperties: false required: - name - people - previous_title - title properties: name: type: string description: >- The event, such as `recipient_added`, `recipient_joined`, `recipient_removed`, `recipient_left` or `conversation_name_updated`. people: type: array description: Up to 10 people a membership event names. items: $ref: '#/components/schemas/Identity' previous_title: type: - string - 'null' description: The title before a rename. title: type: - string - 'null' description: The title after a rename. Attachment: type: object description: A file attached to a message. additionalProperties: false required: - url - filename - content_type - kind - content_size properties: url: type: - string - 'null' filename: type: - string - 'null' content_type: type: - string - 'null' kind: type: - string - 'null' description: The kind of file the server derived, such as `image` or `pdf`. content_size: type: - integer - 'null' description: Size in bytes, when the client sent it. securitySchemes: MemberBearer: type: http scheme: bearer description: | A member credential in the `Authorization: Bearer` header: a member session JWT, a portal JWT whose login is linked to a membership in that company, or a member token. The credential alone identifies the member and company. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.