Static helper that builds a payment prompt object for use with the prompts
parameter of pay().
Payment prompts customize the TTS messages played during different stages of
payment collection.
The payment stage this prompt applies to (e.g., "payment-card-number",
"expiration-date", "security-code", "postal-code").
List of prompt actions. Use createPaymentAction()
to build each entry.
Space-separated card types this prompt applies to (e.g., "visa mastercard").
Space-separated error types this prompt handles.
PaymentPrompt — A prompt object to pass in the prompts list of pay().