Adyen

{
    "mode" : "(required) APIKey Authentication (value = 'apikey') OR Username and Password (value = 'basic') authentication methods.",
    "merchant_account_id" : "(required) Merchant Account Id",
    "api_url_random_hex" : "(required in production, live mode) Random prefix for URL",
    "api_url_company_name" : "(required in production, live mode) Company name at Adyen",
    "api_key" : "(required with APIKey authentication mode) Provided by Adyen",
    "username" : "(required with Username and Password authentication mode) Provided by Adyen",
    "password" : "(required with Username and Password authentication mode) Provided by Adyen"
}

"gatewaySpecificFields":{
    "adyen":{
          "shopper_interaction": "custom additional field that's possible to pass to Adyen",
          "customer_id" : "If provided, this value is sent as shopperReference instead of the regular customer_id submitted in the base payload",
          "shopper_statement" : "Provide shopper statement value here",
          "paymentmethod_type" : "Possible values are applepay and paywithgoogle",
      	  "manual_capture": "Set to true to require manual capture for the transaction.",
          "line_items": [
                    {
                        "amountExcludingTax": "Item amount excluding the tax, in minor units.",
                        "quantity": "Number of items"
                    }
                ],
          "recurring_processing_model" : "Possible value is UnscheduledCardOnFile. If no value is sent, Subscription will be the default value."
    }
}