sinch-10dlc

Sinch 10DLC Registration

Overview

10DLC (10-Digit Long Code) is the required US registration system for Application-to-Person (A2P) SMS on standard 10-digit phone numbers. You must register a brand (the sending company) and a campaign (the messaging use case) with The Campaign Registry (TCR) via Sinch before sending any US A2P SMS.

Agent Instructions

Before generating code, gather from the user (skip any item already specified in the prompt or context):

1. Goal — register a brand, register a campaign, check status, or troubleshoot a rejection?
2. Brand ID? — if the user already has one, skip to Step 3 (qualify) or Step 4 (campaign).
3. Registration type — SIMPLIFIED (faster, lower throughput, $10) or FULL (recommended for production, $50)?
4. Language — any language, or curl. This API is REST-only; there is no SDK wrapper. Use curl, fetch, axios, requests, or equivalent HTTP clients.

This skill covers 10DLC only. The same Registration API also includes TFN (Toll-Free Number) verification endpoints — for toll-free registration, see the API spec directly.

Refer to the API reference linked in Links for request/response schemas.

Security: See the Security section below for url fetching policy and credential handling.

Source of Truth — what to load, and what is authoritative

This skill has two kinds of content with UNEQUAL reliability. Follow this precedence:

1. Canonical docs at developers.sinch.com (AUTHORITATIVE). The .md doc links in this skill are the single source of truth for exact request/response schemas, field names and nesting, enum values, signature/auth schemes, and limits. Before writing code that constructs a payload, verifies a signature, or parses a callback/response, fetch the specific linked doc and confirm the exact shape there. Fetching first-party developers.sinch.com URLs is permitted by the Security/URL policy. Never invent, guess, or pattern-extrapolate a documentation URL — only fetch doc URLs written verbatim in this skill or reached by following a link on a page you already fetched; a trusted domain does not make a guessed path real.
2. Bundled references/*.md (NAVIGATIONAL SUMMARIES — not authoritative). They orient you and point at the right canonical doc; they may lag, omit fields, or simplify nesting. Use them to decide what to build and which doc to open. Do NOT transcribe a field name, nesting, encoding, or enum from a reference or from the SKILL.md overview into shipped code without confirming it in the tier-1 doc. If a detail appears only in a summary, treat it as unverified and say so.