Does PXP Financial have an integration guide?

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• What integration models does PXP Financial support (POS, ecom via direct integration, ecom via checkout, shopping carts, 3rd party integration e.g. payon, rocketgate)?
• What is the difference between aggregation and gateway model? Which model is best for me?
• How can I verify that the connection between my system and PXP Financial’s payment platform is up and running?