Custom Conversion Setup for Facebook Ads

I'm looking for an expert to set up a custom conversion for my Facebook Ads campaign. The main objective is to optimize the campaign for conversions.

Key Requirements:
- Create a custom conversion to track clicks on the 'order now' button which directs to an external site.
- The external site is WhatsApp.

Ideal Skills:
- Proficient in Facebook Ads Manager.
- Experience in setting up custom conversions.
- Understanding of eCommerce and digital marketing.
- Familiarity with tracking conversion events.

Please bid only if you have the necessary skills and experience. Thank you.