The StreetText 7 day trial allows you to run proven ads and start generating leads without having to subscribe to the system. During this time though you will be required to pay Facebook for your Facebook ad spend over this period.
We recommend running ads around $7 a day per ad to fully utilize the trial and see if it will work for you!
If you have received this message to ad a payment method on your Facebook Ad Account, you can do so here https://www.facebook.com/ads/manager/account_settings/account_billing/