How to use Android Pay on LeEco Le pro 3?

[AC Question]

When I open Android Pay on my Leeco Le Pro 3, it said : "Android Pay can't be used on this device - This may be because your device is rooted, has an unlocked bootloader or is running a custom ROM. As a result, Google can't confirm that your device meets Android Pay's security standards". My phone isn't rooted!
Can you help me please!
Thank you!

 

[belodion]

Do any of those things apply in fact?

 

[homniaxor]

I don't know, I guess that the bootloader in my phone isn't unlocked. I don't know if it's worth to do it. So, if anyone have another solution, I would take it.