Multi-tenant architectures on Sent: profiles vs. accounts

This guide shows you how to choose and set up a tenant model for a platform or ISV that sends messages on behalf of multiple customers. Sent's primary multi-tenancy mechanism is Sender Profiles: isolated messaging identities inside one organization, provisioned through the API. A single shared account and fully separate accounts remain workable alternatives at the two ends of the isolation spectrum, and both are covered below with their constraints.

It assumes you can already send messages. The profile-based setup additionally requires an organization account (GET /v3/me returns "type": "organization") and an API key whose user has the admin role. See roles and permissions.

Compare the three tenant models

To pick a model:

• If you onboard tenants programmatically, or tenants need a dedicated US A2P (TCR) registration, a dedicated sender, or a WhatsApp presence of their own, use Sender Profiles. Isolated contact lists and templates come with the model rather than being a reason to choose it.
• If every tenant sends the same kind of content under your platform's single brand and sender identity, a shared account is enough, provided you accept the shared rate limit pool and build tenant attribution yourself.
• If tenants must own their Sent relationship end to end (their own login and billing relationship, no shared organization), use separate accounts and treat each one as an independent integration.

Build on Sender Profiles

This is the recommended model: one organization, one profile per tenant. The full provisioning walkthrough with every field, status, and failure mode is Create and activate Sender Profiles via the API; the sequence below is the architecture-level view.

curl -X POST "https://api.sent.dm/v3/sender-profiles" \
  -H "x-api-key: $ORG_API_KEY" \
  -H "Idempotency-Key: create-profile-tenant-42" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Tenant 42 Coffee Co",
    "short_name": "T42COFFEE",
    "description": "Sender profile for tenant 42",
    "billing": { "inherit": true }
  }'

curl -X POST "https://api.sent.dm/v3/messages" \
  -H "x-api-key: $ORG_API_KEY" \
  -H "x-profile-id: $PROFILE_ID" \
  -H "Content-Type: application/json" \
  -d '{"to": ["+15551234567"], "template": {"id": "tmpl_123"}}'

Alternative: one shared account

If all tenants message under your platform's brand, with the same sender identity, the same templates, and no per-tenant compliance registration, you can run everything through a single account.

The send request has no tenant or metadata field, so tenant attribution is entirely your app's job. Record the mapping when you send, using the message_id values the API returns:

const response = await client.messages.send({
  to: recipients,
  template: { id: templateId }
});

// The request body carries no tenant identifier — persist the mapping yourself
await db.messages.insertMany(
  response.data.recipients.map((r) => ({
    sentMessageId: r.message_id,
    to: r.to,
    tenantId: tenant.id
  }))
);

Webhook handlers then look up the tenant by payload.message_id, exactly as in the per-profile attribution pattern.

Constraints to plan for:

• All tenants share one 10,000 requests-per-minute pool. The ceiling is high enough that a single tenant is unlikely to starve the others, but one runaway tenant can still consume it. Enforce per-tenant quotas in your own app. See How to handle Sent API rate limits.
• Every tenant sends from the same numbers, templates, and TCR registration; a compliance problem caused by one tenant affects all of them.
• If you later need isolation, you can move a tenant onto a Sender Profile without leaving your organization. That migration path is the main argument for starting with profiles even when sharing would work today.

Alternative: separate accounts per tenant

If each tenant must be Sent's customer of record (their own login, billing, and compliance standing, and no shared organization), give each tenant a separate account. There is no API for creating accounts, so each tenant signs up through the dashboard themselves; your platform stores their API key and treats each account as an independent integration:

// One secrets-manager entry per tenant; a leaked key exposes one tenant, not all
const client = new SentDm({
  apiKey: await secrets.get(`sent-api-key-${tenant.id}`)
});

Each account has its own rate limit pool and its own bill. The costs are operational: onboarding cannot be automated, nothing (templates, contacts, registration) can be shared, and there is no organization-level view across tenants. Before choosing this model, check whether a Sender Profile with dedicated billing and a dedicated sender already gives the tenant what they actually need (direct billing and full data isolation) without giving up API provisioning.

Verify your setup

• Send a test message as one tenant (their profile key, x-profile-id scope, or their account key) and confirm the 202 response, then confirm the delivery events for those message_id values resolve to the same tenant in your database.
• For profile-based setups, list templates with tenant A's key and confirm you see only that profile's templates, never tenant B's.
• For shared-account setups, confirm your per-tenant quota enforcement triggers before the account-wide limit does: a tenant at its quota should be throttled by your app, not by a 429 that affects every tenant.

Related pages

• Sender Profiles: the inheritance and governance model behind profile-based multi-tenancy
• Create and activate Sender Profiles via the API: the full provisioning walkthrough
• Integrating Sender Profiles into Your Application: per-tenant sending and webhook attribution in eight languages
• Creating a Sender Profile: the dashboard flow
• Rate Limits: pool scoping rules for accounts, profiles, and x-profile-id