Orders API Questions

Hi, have a few questions regd. Orders API usage

  1. What is the order object construct to place below orders?
    a) Buy Stop ZIP @ 30.3 w/ HALF Stop Loss @ 28.22 HALF Stop Loss @ 29.3
    b) Buy Stop RBLX @ 120.16 w/ Stop Loss @ 5%

  2. How can one get the last filled price to calculate Stop Loss $ if the source specifies place Stop Loss @5% as the Orders API does not have a Stop% attribute?

Thank You!