​
Worldpay

http://support.worldpay.com/support/CNP-API/content/testresprea.htm
Example: 
        "CreditCard":{
            "PaymentAccountNumber": "4444333322221111",
            "ExpirationDate": "0330",
            "SecurityCode": "737"
        }
Here is an example of a WorldPay Sandbox Card that will fail 
        "CreditCard":{
            "PaymentAccountNumber": "4457002900000007",
            "ExpirationDate": "0330",
            "SecurityCode": "737"
        }

{
    "customerId": null,
    "invoiceId": 208545,
    "merchantInvoiceRefId": "ABC309500654810",
    "merchantPaymentMethodRefId": null,
    "networkTransactionId": "285875575070769",
    "invoiceStatus": "Noncollectable",
    "invoiceAttemptStatus": "Fail",
    "message": "Generic Decline",
    "amount": {
        "currency": "USD",
        "value": 1.03
    },
    "paymentMethodId": 6391,
    "paymentMethodTypeId": 1
}

​
Adyen

https://docs.adyen.com/development-resources/testing/test-card-numbers
Example: 
        "CreditCard":{
            "PaymentAccountNumber": "4444333322221111",
            "ExpirationDate": "0330",
            "SecurityCode": "737"
        }

​
Nuvei

https://docs.nuvei.com/documentation/integration/testing/testing-cards/

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EPX

EPX Credit Cards data for testing: Payment Account Number- 4000000000000002, Security Code - 123, Expiration Date - any but should be great than current date. Make amount 1.00 for success EPX ACH data for testing: RoutingNumber - 031100092, AccountNumber - any https://developer.paymentshub.com/supplemental-resources/epx-credit-card-test-data Create a developer account to see various options on test cards or the most up to date. To Trigger other responses use this information: 
    "PaymentMethod": {
        "BillingAddress": {
            "AddressLine1": "123 N CENTRAL",
            "PostalCode": "12345"
        },
        "BillingFirstName": "Joe",
        "BillingLastName": "Smith",
        "CreditCard": {
            "PaymentAccountNumber": "4000000000000002",
            "ExpirationDate": "1225",
            "SecurityCode": "123"
        }
    },
For amount value use the below values to trigger different responses Table of EPX test amounts and their corresponding API responses

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TSYS

Visa 4012000098765439 12/25, 999, Value: 0.52 MasterCard 5146 XXXX 3150 0000 5146 XXXX 3122 0000 Testing Billing address 
        "BillingAddress": {
            "AddressLine1": "100 Main St",
            "City": "Tempe",
            "State": "AZ",
            "PostalCode": "85284",
            "Country": "USA"
        }
Note the values are very important and trigger different results For ACH - Worldpay has some test cards http://support.worldpay.com/support/CNP-API/content/testddtrans.htm
Checkout Line Items Value Types