Hello @katodica

Yes, integration of Mercado Pago and Knit Pay is possible. For this, you need to install an additional plugin (Knit Pay Pro) with Knit Pay plugin. Link of the plugin is given below.
https://wordpress.org/plugins/knit-pay-pro/

Please note, Knit Pay Pro plugin is free for you if you want to receive less than 25 successful transactions per month. As mentioned on the description of Knit Pay Pro plugin page also, you can find more details about the plans at
https://rapidapi.com/knitpay/api/knit-pay-pro1/pricing