In the case of Meta, the ROAS metric is calculated in the same way as in Google, however, the configuration is different, since it is done directly in the code of your website where you must place the Facebook pixel.
Find the code snippet where your events are located.
Edit the value of 0.00 to the value in the currency you are using (the value must have decimals greater than or equal to zero
Edit the currency with 3 letters of the standard code of ISO currency ISO 4217 standard. (https://www.currency-iso.org/en/home/tables.html)
Once the code has been edited, you should see something similar to the following image:
For more information visit: https://www.facebook.com/business/help/392174274295227
Once the values are established in the Meta pixel of your website, Adext AI can calculate the ROAS and show it in your dashboards.