Confirm each text opt-in

How to do it

Store consent as in ask before any marketing message, with the phone number and the exact wording. Send the confirmation at once, and send nothing else until it is delivered. Carriers and the CTIA Messaging Principles expect this message and check for it when they approve a campaign. Name your brand at the start of every text, so people know who wrote.

Example

export const smsConfirmation = brand =>
  `${brand}: You're signed up for order and offer texts, up to 4 msgs/month. Msg and data rates may apply. Reply HELP for help, STOP to cancel.`;

def sms_confirmation(brand: str) -> str:
    return (f"{brand}: You're signed up for order and offer texts, up to 4 msgs/month. "
            "Msg and data rates may apply. Reply HELP for help, STOP to cancel.")

def test_confirmation_has_required_parts():
    text = sms_confirmation("ExampleShop")
    for part in ("ExampleShop", "msgs/month", "rates may apply", "HELP", "STOP"):
        assert part in text

How to check

Opt in a test phone. The first text names the brand, the frequency, "Msg and data rates may apply", and both HELP and STOP. A template test fails if any of those words is missing.