I new to Shopify and i facing such kind of issues as below.
Requirement :- I want to send an sms to every customer as an reminder after the 6th month of the product purchase for servicing.
Working :- For that i need to implement cronjob, so that i can send an sms to my customers by integrating with twilio as per sceduled time i.e. cronjob process. So please tell me how could i do it inside the shopify.
There is no out-of-the-box solution in Shopify that would cover your scenario. You'll have to implement your own service and host it separately. You can use Shopify Admin API, Webhooks to subscribe to new orders and keep track of the date the purchase was made as well as whether the SMS was already sent to the customer.
I think you could solve it this way. Not totally w/in Shopify, but using some plug-and-play services:
ShopClerk Order Tracking for Shopify
I was able to set this up for you in our new automation app, Mr. Arigato in just a few minutes. You can find it in our Workflow Library under "Send an SMS message to customer 6 months after purchasing a particular product". You can add additional actions to also send them an email at the same time if you needed it.