To accept payments through MONEI in your Shopify store you simply need to install and configure MONEI Payment Gateway.
Install MONEI Payment Gateway in your Shopify store.
Configure MONEI Payment Gateway in your Shopify store payment settings.
Go to your Shopify Settings → Payments → Third-party providers
Search for "Paga con Tarjeta de Crédito/Débito - Pay by Credit/Debit Card"
Enter your Account ID and Password. You can find your Account ID and Password in MONEI Dashboard → Settings and click "Activate".
If you want a payment method to have a different name (not "Paga con Tarjeta de Crédito/Débito - Pay by Credit/Debit Card") or if you have any other questions please contact support.