In Step 3, your
POST to this endpoint created a unique tracking subscription ID, which you can find in the response payload. You can now pass in this
tracking_subscription_id to modify the subscription start and end time if you need to adjust the pickup or dropoff time for the load. Note that the new
start_time can only be earlier than the original, and the new
end_time can only be later than the original.
Read our reference documentation about the Subscribe endpoint for details.