Question

If by credit line you mean available to take out of an ATM or get a cash advance then no. it is purely a credit card and does not allow those things. When you apply for the card you will be given an available credit based on the information you provide to Goldman Sachs. How your Apple Card application is evaluated - Apple Support

You best ask Goldman Sachs or Apple; we are all other users here and do not work for either place, sorry about that.