RCS security best practices

Treat the messaging platform like any other system holding customer data: rotate and scope API keys, sign and verify webhooks, restrict who can send and edit campaigns, and log everything. On the content side, lead with your verified brand so customers learn to trust the badge, and never ask for full passwords or card numbers over the channel.

SimplyRCS supports these directly: scoped API keys shown once, signed webhooks, role-based team access, verified sender setup, pre-approved content rules, and per-channel consent, so the secure path is the default path. The controls underneath that, SOC 2 Type II, encryption in transit and at rest, and least-privilege access, are set out on the platform security page.

It helps to attach each habit to the phase where it is cheap to get right, because retrofitting any of them is considerably harder than building them in.

At setup, register the brand and agent to your own legal entity rather than to a vendor, scope credentials per environment so staging keys cannot reach real customers, and decide who may send before anyone can. At build, verify webhook signatures over the raw request body, make handlers idempotent, and write opt-outs to a single suppression store shared by every channel. In content, decide what never appears in a message body, and hold that line: no full account numbers, no passwords, no one-time codes you also accept as authentication elsewhere. In operation, review who holds send access on a schedule, alert on volume and failure-rate anomalies rather than only on outages, and keep consent and send records for as long as your retention policy requires.

Have the credential-compromise path written down before you need it, since the response order matters and is not obvious under pressure. Revoke the exposed key first, before investigating, because the investigation takes longer than the damage does. Then review the send log for the exposure window to establish what was actually sent, since that determines whether this is an internal matter or a customer-notification one. Then rotate the remaining credentials, check whether the webhook secret was in the same place as the API key, and only then work out how it leaked. A key in a client-side bundle or a public repository is the common cause, and both are worth an automated check rather than a habit.

One structural point underpins all of it: the highest-value target in a messaging system is not the message data, it is the ability to send. A stolen credential lets an attacker speak to your entire customer base from your verified identity, which is more damaging than reading historical traffic. Protect send capability accordingly, and treat a production messaging key with the care you would give a payment credential.