What facebook conversion event should i use for cpa ?

i am promoting some ecom (products) cpa offers from maxbounty.
the typical flow is like this

fb ad -> landing page (with cta button) -> offer page

i am running a couple of video view and traffic campaigns to the offer.
now i am thinking of using conversion optimised campaign.

i would count cta button click on the landing page as a conversion.
so what event should i use ? some of my options are:

1. Lead
2. View Content
3. Add to Cart

which would be the best ?

You can go ahead and try using conversion campaigns. You need to define however what a conversion is.

Facebook doesn't know what a conversion is, it depends on how you place the pixel.

If you plan to use the conversion as a campaign goal, you will need to place the fb pixel + the "conversion" pixel on the thank you page RIGHT after the purchase has been done. This is fundamentally important.

You will also need to work with retargeting to really make ecom on fb profitable.

Good luck!

You know......if people send you messages there at your page,you can make them do the offer,that's the best. I use that,at the other side,i also set the button on my landing page to fire up a convert pixel when pressed. But as i said,u better first setup and try to promote a post with "SEND MESSAGE" button. And of course,you want to make some automated Fb messages with your site/LP links when someone texts you. The convert rate will be much higher this way.