CPA offers that require CC submit

Hi all, I want to promote a free trial offer that requires a credit card submit. The credit card won't be charged during the free trial. Let's say I want to promote this on Facebook. Should I choose the conversion objective when setting up an ad? Technically, the prospect isn't being charged but I want to send high quality leads to the merchant (aka people who keep the subscription going).

Can you please share your advice?

Thanks

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