Card constructor
      
      Card({ 
    
    
- String? customerId,
- String? id,
- int? version,
- String? referenceId,
- String? merchantId,
- int? expYear,
- int? expMonth,
- CardType? cardType,
- Address? billingAddress,
- String? bin,
- CardBrand? cardBrand,
- String? cardholderName,
- bool? enabled,
- String? fingerprint,
- String? last4,
- CardPrepaidType? prepaidType,
Implementation
Card(
    {this.customerId,
    this.id,
    this.version,
    this.referenceId,
    this.merchantId,
    this.expYear,
    this.expMonth,
    this.cardType,
    this.billingAddress,
    this.bin,
    this.cardBrand,
    this.cardholderName,
    this.enabled,
    this.fingerprint,
    this.last4,
    this.prepaidType});