https://help.postscript.io/en/articles/13563845-search-your-subscribers
https://help.shopify.com/en/manual/promoting-marketing/create-marketing/shopify-messaging/marketing-automations
https://postscript.io/pricing
https://support.omnisend.com/en/articles/11940394-migrate-to-omnisend-for-sms-email-marketing
https://support.omnisend.com/en/articles/2970778-contacts-sync-with-shopify
https://support.omnisend.com/en/articles/2970778-understand-shopify-contact-data-sync
https://support.omnisend.com/en/articles/4088082-how-omnisend-attributes-sales
https://www.attentive.com/concierge
https://www.klaviyo.com/pricing
https://www.omnisend.com/blog/omnisend-vs-attentive/#sms-automation
https://www.omnisend.com/pricing/