> ## Documentation Index > Fetch the complete documentation index at: https://docs.ugatext.com/llms.txt > Use this file to discover all available pages before exploring further. # Reschedule a Pending Scheduled SMS Message ## OpenAPI ````yaml https://ugatext.com/api/v1/openapi.json post /sms/schedule/{id}/reschedule openapi: 3.0.3 info: title: UgaText Developer Communications API version: 1.0.0 description: >- Official REST API for UgaText (https://ugatext.com/api/v1). Supports single and bulk SMS dispatch across Uganda (+256 via Pandora), Kenya (+254 via Ping Africa), Tanzania (+255 via SwalaSMS), and DR Congo (+243 via Coussema SMS Gateway), real-time queued → sent → delivered status polling, SMS scheduling with recurrence (none, daily, weekly, monthly), bulk campaigns, wallet balance queries, Sender ID lifecycle management, opt-out management, HMAC-SHA256 webhooks, UCC 21-rule compliance inspection, and OTP verification. Rate limit: 600 requests/minute (10 req/sec). Free sandbox numbers: +256700000000, +254700000000, +255700000000, or +243810000000. contact: name: UgaText Developer Support url: https://docs.ugatext.com email: support@ugatext.com servers: - url: https://ugatext.com/api/v1 description: UgaText Production API Gateway security: - ClientIdHeader: [] ClientSecretHeader: [] tags: - name: System description: Gateway health, route index, and OpenAPI specification - name: Authentication description: API key verification, generation, configuration, and revocation - name: SMS description: Single and bulk SMS dispatch, status polling, history, and wallet balance - name: Scheduling description: Future SMS scheduling, recurrence, rescheduling, and cancellation - name: Campaigns description: Bulk SMS campaign creation, listing, details, and cancellation - name: Verify description: OTP verification sessions, services/apps, and analytics - name: Sender IDs description: >- Alphanumeric Sender ID registration, regulatory documents, wallet payment, and lifecycle - name: Webhooks description: Real-time HMAC-SHA256 delivery receipt webhooks and test dispatch - name: Opt-Outs description: Recipient opt-out suppression list management - name: Compliance description: Pre-flight 21-rule UCC SMS compliance and GSM segmentation inspection paths: /sms/schedule/{id}/reschedule: post: tags: - Scheduling summary: Reschedule a Pending Scheduled SMS Message parameters: - name: id in: path required: true schema: type: string example: sched_1760425200000_1a2b3c4d description: The scheduled message ID to reschedule requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/RescheduleSMSRequest' responses: '200': description: Scheduled message rescheduled successfully content: application/json: schema: $ref: '#/components/schemas/ScheduleSMSResponse' '400': description: INVALID_REQUEST or INVALID_SCHEDULE_TIME content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: INVALID_API_KEY (missing, invalid, or revoked credentials) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: NOT_FOUND content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: RATE_LIMIT_EXCEEDED (600 requests/minute limit exceeded) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - ClientIdHeader: [] ClientSecretHeader: [] components: schemas: RescheduleSMSRequest: type: object required: - scheduled_at properties: scheduled_at: type: string format: date-time description: 'New future ISO-8601 timestamp (accepted alias: "scheduledAt").' example: '2026-12-02T09:00:00.000Z' recurrence: type: string enum: - none - daily - weekly - monthly description: >- Optional updated repeat interval ("none", "daily", "weekly", or "monthly"). Preserves existing recurrence when omitted. message: type: string description: Optional updated SMS message text. ScheduleSMSResponse: type: object properties: success: type: boolean example: true message_id: type: string example: sched_1760425200000_1a2b3c4d status: type: string example: scheduled recipient: type: string example: '+256700000000' sender_id: type: string example: UGATEXT scheduled_at: type: string format: date-time recurrence: type: string enum: - none - daily - weekly - monthly example: none segments: type: integer example: 1 cost_units: type: integer example: 0 estimated_cost_ugx: type: number example: 0 cost_ugx: type: number example: 0 currency: type: string example: UGX mode: type: string enum: - live - sandbox example: sandbox ErrorResponse: type: object required: - success - error properties: success: type: boolean example: false retry_after_seconds: type: integer description: >- Seconds to wait before retrying when rate-limited or during an active OTP resend cooldown (HTTP 429). example: 60 error: type: object required: - code - message properties: code: type: string example: INVALID_REQUEST message: type: string example: >- Authentication failed. Provide a valid 'Client-ID' and 'Client-Secret' in the request headers. retry_after_seconds: type: integer description: >- Seconds remaining before another OTP or rate-limited request is permitted (present on 429 COOLDOWN_ACTIVE and rate-limit errors). example: 60 securitySchemes: ClientIdHeader: type: apiKey in: header name: Client-ID description: >- Your UgaText Client-ID (e.g. uga_...). Accepted header aliases: X-Client-ID, or combined in Authorization: Bearer : / X-API-Key: :. ClientSecretHeader: type: apiKey in: header name: Client-Secret description: >- Your UgaText Client-Secret (e.g. sk_live_...). Accepted header alias: X-Client-Secret. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.