Help with custom action

Hello, if someone can help me with a custom action,It is the first time that I am going to implement pays in the app, we use two companies that allow us to do the chekouts. in South America we do not have stripe and paypal, then I must generate the shopping cart with jason … but I do not understand much

https://www.mercadopago.com.ar/developers/es/guides/online-payments/checkout-pro/integration

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