The GetContact function is used to retrieve a contact's information.
When calling this function, the Function parameter sent to the API should be GetContact.
ContactId - This is the Id of the contact. If you added the contact via the API, you'll already have the Id. If you're using a contact that you entered from the CRM, this page explains how to find the Id.
*Note: ContactId should be treated like a string, NOT an integer or any other number type.*
This code shows how to get an existing contact with their Contact Id.