Sender IDs overview - Senderz API

What is a Sender ID?

A Sender ID (SID) is the alphanumeric name displayed as the sender when an SMS arrives on a recipient’s handset. For example, TrackFast instead of a random phone number. In markets with mandatory SID pre-registration (such as Australia under the ACMA SMS Sender ID Register), unregistered SIDs are replaced with Unverified. Registering your SIDs ensures your brand appears as intended.

SID lifecycle

pending_review → pending_register → pending_brand_confirmation → registered
              └→ rejected                                      └→ suspended
                                                                └→ deregistered

Status	Description
`pending_review`	Submitted, awaiting Senderz validation
`pending_register`	Validated, submitted to market register
`pending_brand_confirmation`	Awaiting brand owner confirmation (e.g. ACMA Assist/myID step for AU)
`registered`	Live on the register. Messages display the branded SID.
`rejected`	Registration denied. See `rejection_reason`.
`suspended`	Temporarily suspended by register or Senderz.
`deregistered`	Removed from register.

SID rules

Rule	Value
Length	2-11 characters
Characters	Alphanumeric (A-Z, a-z, 0-9) and spaces
Restriction	Cannot be numbers only
Match requirement	Must match the brand’s registered business name, company name, trademark, or domain

Market-specific validation

Validation rules are applied server-side based on the market field. For example, the AU market applies ACMA restricted-word checks and ABR cross-referencing. A 422 response with a market-specific error code is returned if rules are violated. New markets are added by extending the market configuration. No API version change is required. Customers integrating against /v1/ pick up new markets by passing the relevant country code.

​What is a Sender ID?

​SID lifecycle

​SID rules

​Market-specific validation

What is a Sender ID?

SID lifecycle

SID rules

Market-specific validation