> ## Documentation Index
> Fetch the complete documentation index at: https://help.onetsolutions.net/llms.txt
> Use this file to discover all available pages before exploring further.

# [Instances] Price a move to a longer billing cycle

> Prices a change of billing cycle on the current size, without touching the hardware and without creating an order or an invoice. Only cycles longer than the current one and priced for the current size are offered: a shorter cycle would refund part of a term already paid, and a cycle the product does not price is refused by WHMCS.



## OpenAPI

````yaml https://api.onetsolutions.net/schema post /v1/organizations/{organization_id}/projects/{project_id}/compute/instances/{id}/billing-cycle-preview
openapi: 3.0.3
info:
  title: OnetSolutions API
  version: v1 (v1)
  description: >

    ## Overview


    The OnetSolutions API provides programmatic access to manage your cloud
    infrastructure, domains, and web hosting services.


    ## Authentication


    All API requests require authentication using one of the following methods:


    - **JWT Token**: Obtain a token via login endpoints and include it in the
    `Authorization: Bearer <token>` header

    - **API Key**: Generate an API key from your account settings and use it as
    `Authorization: Bearer sk-onetsolutions-...`


    ## Rate Limiting


    API requests are rate-limited to ensure fair usage:

    - **Standard**: 1000 requests per minute

    - **Burst**: 100 requests per second


    ## Pagination


    List endpoints return paginated results. Use `page` and `page_size` query
    parameters.


    ## Error Handling


    The API uses standard HTTP status codes:

    - `200` Success

    - `201` Created

    - `400` Bad Request

    - `401` Unauthorized

    - `403` Forbidden

    - `404` Not Found

    - `429` Too Many Requests
servers:
  - url: https://api.onetsolutions.net
    description: Production
security: []
tags:
  - name: Authentication
    description: >-
      Login, passwordless authentication, MFA, OAuth providers, and token
      management.
  - name: Organizations
    description: >-
      Organization management, members, roles, modules, audit logs, and
      notification settings.
  - name: Projects
    description: Project management, team members, and project-scoped resources.
  - name: Compute
    description: >-
      Cloud instances, volumes, snapshots, backups, VPCs, firewalls, SSH keys,
      uptime monitors, and instance tasks.
  - name: Billing
    description: >-
      Shopping cart, orders, invoices, payments, payment methods, gateways,
      promo codes, and balance management.
  - name: Domains
    description: >-
      Domain availability, registration, transfers, DNS zones, DNS records, and
      TLD information.
  - name: Web Hosting
    description: >-
      cPanel-based web hosting, emails, databases, subdomains, FTP accounts,
      addon domains, and SSL certificates.
paths:
  /v1/organizations/{organization_id}/projects/{project_id}/compute/instances/{id}/billing-cycle-preview:
    post:
      tags:
        - Compute
      summary: '[Instances] Price a move to a longer billing cycle'
      description: >-
        Prices a change of billing cycle on the current size, without touching
        the hardware and without creating an order or an invoice. Only cycles
        longer than the current one and priced for the current size are offered:
        a shorter cycle would refund part of a term already paid, and a cycle
        the product does not price is refused by WHMCS.
      operationId: preview_instance_billing_cycle_change
      parameters:
        - in: path
          name: id
          schema:
            type: string
            format: uuid
          description: A UUID string identifying this Instance.
          required: true
        - in: path
          name: organization_id
          schema:
            type: string
          description: Unique identifier of the organization that owns the resource.
          required: true
        - in: path
          name: project_id
          schema:
            type: string
          description: Unique identifier of the project containing the resource.
          required: true
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InstanceBillingCycleChange'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InstanceBillingCyclePreview'
          description: ''
        '400':
          description: Cycle not offered for this service
        '401':
          description: Authentication credentials missing or invalid
        '403':
          description: Insufficient permissions
        '404':
          description: Instance not found
      security:
        - BearerAuth: []
components:
  schemas:
    InstanceBillingCycleChange:
      type: object
      properties:
        billing_cycle:
          type: string
          description: >-
            Cycle to move the service to. Only a longer cycle the size is priced
            for is accepted.
      required:
        - billing_cycle
    InstanceBillingCyclePreview:
      type: object
      properties:
        current_billing_cycle:
          type: string
        available_billing_cycles:
          type: array
          items:
            type: string
        billing_cycle:
          type: string
        total_price:
          type: string
          pattern: ^-?\d{0,10}(?:\.\d{0,2})?$
          nullable: true
        currency:
          type: string
        recurring_price:
          type: string
          pattern: ^-?\d{0,10}(?:\.\d{0,2})?$
          nullable: true
        recurring_monthly_equivalent:
          type: string
          pattern: ^-?\d{0,10}(?:\.\d{0,2})?$
          nullable: true
        monthly_reference_price:
          type: string
          pattern: ^-?\d{0,10}(?:\.\d{0,2})?$
          nullable: true
        monthly_savings_percent:
          type: string
          pattern: ^-?\d{0,3}(?:\.\d{0,2})?$
          nullable: true
      required:
        - available_billing_cycles
        - billing_cycle
        - currency
        - current_billing_cycle
        - monthly_reference_price
        - monthly_savings_percent
        - recurring_monthly_equivalent
        - recurring_price
        - total_price
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT or API Key
      description: >-
        Use `Authorization: Bearer <token>` header. Token can be a JWT token or
        an API key (format: `sk-onetsolutions-...`).

````