> ## Documentation Index > Fetch the complete documentation index at: https://api-docs.helpyousponsor.com/llms.txt > Use this file to discover all available pages before exploring further. # Start Email Sign-In > Starts the email-based sign-in flow with a six-digit numeric code and magic link. A new issue invalidates the previous code for the tenant, program, donor, and email scope. ## OpenAPI ````yaml post /frontend/passwordless_login/{client_id}/{program_id}/{session_id} openapi: 3.0.0 info: title: Gratona API description: >- REST API for the Gratona fundraising platform, including donor, donation, sponsorship, program, event, and integration workflows. Endpoints are organized by tag. Most endpoints require either a Passport bearer token or an issued API key — see the Security Schemes section. contact: name: Gratona Engineering url: https://gratona.com email: devs@gratona.com version: 1.0.0 servers: - url: https://api.gratona.com/v1 description: Server Version 1.0.0 security: [] tags: - name: Auth description: >- Login, signup, logout, password reset, and email verification for admin users and donors. - name: Donors description: >- Donor records: CRUD, profile fields, household linkage, search, filters, merge, and duplicate detection. - name: Donations description: >- Individual donation records, recurring commitments, soft credits, refunds, designations, and exports. - name: Sponsorships description: >- Donor-to-entity sponsorship relationships, lifecycle transitions, and sponsorship-specific filters. - name: Entities description: >- Recipient records (children, families, projects, animals, etc.), their status, and entity-level fields. - name: Programs description: >- Program / campaign configuration: hierarchy, settings, and program-level metadata. - name: Forms description: >- Custom form builder (HysForm), form fields, standardized donor fields, and field migrations. - name: Trips description: >- Mission-trip management: trips, participants, budgets, tasks, e-signatures, fundraising milestones, and background checks. - name: Communications description: >- Email templates, SMS, newsletters, donor email manager, and per-donor notes. - name: Payments description: >- Payment-gateway management (Stripe, PayPal, Flutterwave, QuickBooks). Excludes inbound webhooks — see the Webhooks tag. - name: Reports description: Dashboards, analytics, scheduled reports, and exports. - name: Admin description: >- Client-account administration: users, groups/permissions, settings, integrations, and account lifecycle. - name: Donor Portal description: >- Endpoints consumed by the donor-facing portal (donor login, dashboard, donation history, messages). - name: Recipient Portal description: Endpoints consumed by the recipient-facing portal. - name: Public description: >- Unauthenticated public endpoints: donor signup, public trip pages, peer-to-peer campaigns, public checkout. - name: Webhooks description: >- Inbound webhooks from third parties (Stripe, PayPal, Flutterwave, Checkr, DropboxSign). Annotated minimally for reference; payload shapes are owned by the upstream provider. - name: Client description: Client - name: Email Settings description: Email Settings - name: Admin Dashboard description: Admin Dashboard - name: Historical Archived Updates description: Historical Archived Updates - name: Team & access description: Team & access - name: Files description: Files - name: Wrapped description: Wrapped - name: Donor SignUp description: Donor SignUp - name: Frontend description: Frontend - name: User description: User paths: /frontend/passwordless_login/{client_id}/{program_id}/{session_id}: post: tags: - Donor Portal summary: Start Email Sign-In description: >- Starts the email-based sign-in flow with a six-digit numeric code and magic link. A new issue invalidates the previous code for the tenant, program, donor, and email scope. operationId: postPasswordlessLogin parameters: - name: client_id in: path description: Client ID for the email sign-in flow required: true schema: type: integer - name: program_id in: path description: Program ID for the email sign-in flow required: true schema: type: integer - name: session_id in: path description: Session ID for the email sign-in flow (optional) required: true schema: type: string requestBody: description: Email address for email sign-in required: true content: application/json: schema: required: - email properties: email: type: string format: email donor_id: description: Optional donor ID when a donor has already been selected type: integer nullable: true passwordless_mode: description: Requested email sign-in delivery mode type: string enum: - magic_link - verification_code nullable: true type: object responses: '200': description: >- Sign-in instructions sent successfully or a donor selection is required content: application/json: schema: properties: status: description: >- `success` when the email sign-in flow continues, or `selection_required` when multiple donor accounts match the email. type: string example: success message: type: string donor: description: >- Returned for auto-resolved single-donor email sign-ins so the frontend can offer verification-code fallback. properties: id: type: integer display_name: type: string username: type: string nullable: true email: type: string format: email type: object nullable: true donors: description: >- Returned when a donor selection is required before sending the sign-in email. type: array items: properties: id: type: integer display_name: type: string username: type: string nullable: true email: type: string format: email type: object type: object '422': description: Validation error content: application/json: schema: properties: message: type: string errors: type: object type: object '429': description: The tenant/endpoint passwordless budget was exceeded. content: application/json: schema: properties: status: type: string example: error message: type: string example: Too many sign-in attempts. Please wait and try again. type: object security: [] ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.