How to pass multiple values or variables from flow(screen element) to invocable method of Apex - Salesforce Globe For You

Solution: You can create wrapper class and use it in the flow.

Example:

Apex Class: ContactCreation

public without sharing class ContactCreation {

    @InvocableMethod(label='create Contact' description='Returns the ContactId')

    public static List<String> createContact(List<ContactWrapper> contactWrap) {

        contact c = new contact();

        c.lastName = contactWrap[0].lastName;

        c.FirstName = contactWrap[0].firstName;

        c.Email = contactWrap[0].contactEmail;

        c.Phone = contactWrap[0].contactPhone;

        insert c;

        List<String> lstContactId = new List<String>();

        lstContactId.add(c.id);

        system.debug('lstContactId:'+lstContactId);

        return lstContactId;

    }

    public class ContactWrapper {

        @InvocableVariable

        public String firstName;

        @InvocableVariable

        public String lastName;

        @InvocableVariable

        public String contactEmail;

        @InvocableVariable

        public String contactPhone;

    }

}

create flow: ContactCreation

output: When you run the flow,the contact record gets created successfully.