What are the consent rules before I send marketing SMS?

In the US, marketing texts require express written consent under the TCPA — a shopper must actively opt in (a pre-checked box does not count), you must honor opt-outs immediately, and quiet-hours rules apply. Reputable SMS platforms build compliant capture and suppression in, but the legal responsibility is the store’s. This is general information, not legal advice; confirm the current rules for the regions you sell into before turning SMS on.