can I know the start to end steps for below scenario
I want to create an inbound custom api. user have to hit this api with start date and end data as parameters and based on the start and end date I have to pass all the records in JSON format. kindly let me know the steps to achieve this

I have contact object and there is a custom object. on the contact page layout I have a related list for custom object. now my requirement is based on the logged in user public group I want to display the custom object records using inline VF page. can someone please code  this.


Thanks