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OpenAPI Specification

openapi: 3.2.0
info:
  description: 'Implementation reference; deployment and live E2E not claimed. Native USDC /30 days: Starter 9 (1 key/1 hook), Business 19 (3/3), Pro 29 (10/10); API/webhooks bundled. Seven-day trial 1/1. Generic Make/n8n/WooCommerce HTTP recipes, not official connectors. Mutations cannot confirm payments. Payment confirmation requires matching verified blockchain ledger evidence. Bearer read/write scopes; management uses dashboard cookie + CSRF. At-least-once signed delivery, durable dedup required; max five attempts. See /developers/reference.'
  title: Skavio Payment Proof REST Invoices API
  version: '1.0'
servers:
- description: Intended public prefix; availability pending deployment
  url: https://www.skavio.eu/proof
tags:
- name: Invoices
paths:
  /v1/invoices:
    get:
      parameters:
      - in: query
        name: limit
        schema:
          default: 50
          maximum: 100
          minimum: 1
          type: integer
      - description: Opaque next_cursor; ID order, not chronological.
        in: query
        name: before
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              schema:
                properties:
                  data:
                    items:
                      $ref: '#/components/schemas/Invoice'
                    type: array
                  next_cursor:
                    type:
                    - string
                    - 'null'
                required:
                - data
                - next_cursor
                type: object
          description: Success
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing, invalid, inactive or insufficient scope key
        '403':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Cross-site or customer-access denial
        '404':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing or foreign resource
        '409':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Idempotency conflict
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Validation or quota failure
        '429':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Rate limit
        '503':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Temporary service failure
      security:
      - PaymentProofBearer: []
      summary: Bounded tenant invoices
      x-required-scope: read
      tags:
      - Invoices
      operationId: getV1Invoices
      x-operation-id-source: derived
    post:
      parameters:
      - description: Persist per business operation. Identical replay returns original response; changed payload/operation returns 409. Tenant scoped, retained durably.
        in: header
        name: Idempotency-Key
        required: true
        schema:
          pattern: ^[A-Za-z0-9_-]{16,80}$
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InvoiceCreate'
        required: true
      responses:
        '201':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Invoice'
          description: Success
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing, invalid, inactive or insufficient scope key
        '403':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Cross-site or customer-access denial
        '404':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing or foreign resource
        '409':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Idempotency conflict
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Validation or quota failure
        '429':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Rate limit
        '503':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Temporary service failure
      security:
      - PaymentProofBearer: []
      summary: Create invoice without automatic mail or payment
      x-required-scope: write
      tags:
      - Invoices
      operationId: postV1Invoices
      x-operation-id-source: derived
  /v1/invoices/{iid}:
    get:
      parameters:
      - in: path
        name: iid
        required: true
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Invoice'
          description: Success
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing, invalid, inactive or insufficient scope key
        '403':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Cross-site or customer-access denial
        '404':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing or foreign resource
        '409':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Idempotency conflict
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Validation or quota failure
        '429':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Rate limit
        '503':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Temporary service failure
      security:
      - PaymentProofBearer: []
      summary: Get tenant invoice
      x-required-scope: read
      tags:
      - Invoices
      operationId: getV1InvoicesByIid
      x-operation-id-source: derived
  /v1/invoices/{iid}/send:
    post:
      parameters:
      - in: path
        name: iid
        required: true
        schema:
          type: string
      - description: Persist per business operation. Identical replay returns original response; changed payload/operation returns 409. Tenant scoped, retained durably.
        in: header
        name: Idempotency-Key
        required: true
        schema:
          pattern: ^[A-Za-z0-9_-]{16,80}$
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SendApproval'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SendResult'
          description: Success
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing, invalid, inactive or insufficient scope key
        '403':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Cross-site or customer-access denial
        '404':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Missing or foreign resource
        '409':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Idempotency conflict
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Validation or quota failure
        '429':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Rate limit
        '503':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Temporary service failure
      security:
      - PaymentProofBearer: []
      summary: Queue email only after actual explicit user approval
      x-required-scope: write
      tags:
      - Invoices
      operationId: postV1InvoicesByIidSend
      x-operation-id-source: derived
webhooks:
  proofEvent:
    post:
      parameters:
      - description: Unix seconds; reject clock difference >300 seconds
        in: header
        name: X-Skavio-Timestamp
        required: true
        schema:
          type: string
      - description: v1=<64 lowercase hex>; HMAC SHA256 of timestamp + dot + untouched body bytes
        in: header
        name: X-Skavio-Signature
        required: true
        schema:
          type: string
      - description: Must match signed body id; durable deduplication key
        in: header
        name: X-Skavio-Event-Id
        required: true
        schema:
          type: string
      - description: Stable delivery ID across retries
        in: header
        name: X-Skavio-Delivery-Id
        required: true
        schema:
          type: string
      - description: Signing secret version
        in: header
        name: X-Skavio-Key-Version
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Event'
        required: true
      responses:
        '204':
          description: Return 2xx only after atomic durable dedup/business outbox commit; retries retain event/delivery IDs.
      summary: Signed event to registered public HTTPS endpoint; raw-byte HMAC verification…
      tags:
      - Invoices
components:
  schemas:
    Error:
      properties:
        error:
          type: string
      required:
      - error
      type: object
    Invoice:
      properties:
        customer_id:
          type: string
        due_at:
          type: integer
        id:
          type: string
        issued_at:
          type: integer
        items:
          items:
            type: object
          type: array
        network:
          type: string
        number:
          type: string
        payment_atomic:
          description: Native USDC atomic units (six decimals); pay exact amount including matching delta.
          minimum: 1
          type: integer
        receiver:
          type: string
        request_id:
          type: string
        status:
          type: string
        tax_atomic:
          type: integer
        total_atomic:
          description: Native USDC atomic units (six decimals); pay exact amount including matching delta.
          minimum: 1
          type: integer
      required:
      - id
      - request_id
      - status
      - payment_atomic
      type: object
    Event:
      properties:
        api_version:
          const: '1.0'
        data:
          properties:
            amount_atomic:
              description: Native USDC atomic units (six decimals); pay exact amount including matching delta.
              minimum: 1
              type: integer
            invoice_id:
              type: string
            network:
              type: string
            number:
              type: string
            quoted_amount_atomic:
              description: Native USDC atomic units (six decimals); pay exact amount including matching delta.
              minimum: 1
              type: integer
            request_id:
              type: string
            status:
              type: string
            tx_hash:
              type:
              - string
              - 'null'
            verified_at:
              type: integer
          required: []
          type: object
        id:
          type: string
        occurred_at:
          type: integer
        type:
          enum:
          - payment_request.created
          - invoice.issued
          - invoice.voided
          - payment.confirmed
          - invoice.paid
      required:
      - id
      - api_version
      - type
      - occurred_at
      - data
      type: object
    InvoiceCreate:
      additionalProperties: false
      properties:
        accounting:
          description: Existing dashboard accounting validation applies; see reference.
          type: object
        customer_id:
          type: string
        customer_receipt_opt_in:
          const: false
        due_date:
          format: date
          type: string
        items:
          items:
            $ref: '#/components/schemas/Item'
          minItems: 1
          type: array
        reminder_opt_in:
          const: false
        send_now:
          const: false
        tax_mode:
          type: string
        tax_notes:
          type: string
        tax_rate:
          type: string
        tax_usdc:
          type: string
        wallet_id:
          type: string
      required:
      - customer_id
      - wallet_id
      - due_date
      - items
      type: object
    SendApproval:
      additionalProperties: false
      properties:
        user_approved:
          const: true
      required:
      - user_approved
      type: object
    Item:
      properties:
        description:
          type: string
        quantity:
          type: string
        unit_usdc:
          type: string
      required:
      - description
      - quantity
      - unit_usdc
      type: object
    SendResult:
      properties:
        id:
          type: string
        mail_status:
          type: string
      required:
      - id
      - mail_status
      type: object
  securitySchemes:
    PaymentProofBearer:
      description: Payment Proof skp_ key only; read for GET, write for POST. No cookie fallback.
      scheme: bearer
      type: http