PaymentModel

public class PaymentModel {
    @SerializedName("transaction_details")
    @Expose
    private TransactionDetails transactionDetails;
    @SerializedName("item_details")
    @Expose
    private List<ItemDetail> itemDetails = null;
    @SerializedName("customer_details")
    @Expose
    private List<CustomerDetail> customerDetails = null;

    public TransactionDetails getTransactionDetails() {
        return transactionDetails;
    }

    public void setTransactionDetails(TransactionDetails transactionDetails) {
        this.transactionDetails = transactionDetails;
    }

    public List<ItemDetail> getItemDetails() {
        return itemDetails;
    }

    public void setItemDetails(List<ItemDetail> itemDetails) {
        this.itemDetails = itemDetails;
    }

    public List<CustomerDetail> getCustomerDetails() {
        return customerDetails;
    }

    public void setCustomerDetails(List<CustomerDetail> customerDetails) {
        this.customerDetails = customerDetails;
    }

    public class TransactionDetails {

        @SerializedName("order_id")
        @Expose
        private String orderId;
        @SerializedName("gross_amount")
        @Expose
        private Integer grossAmount;

        public String getOrderId() {
            return orderId;
        }

        public void setOrderId(String orderId) {
            this.orderId = orderId;
        }

        public Integer getGrossAmount() {
            return grossAmount;
        }

        public void setGrossAmount(Integer grossAmount) {
            this.grossAmount = grossAmount;
        }

    }

    public class ItemDetail {

        @SerializedName("id")
        @Expose
        private String id;
        @SerializedName("price")
        @Expose
        private Integer price;
        @SerializedName("quantity")
        @Expose
        private Integer quantity;
        @SerializedName("name")
        @Expose
        private String name;
        @SerializedName("brand")
        @Expose
        private String brand;
        @SerializedName("category")
        @Expose
        private String category;
        @SerializedName("merchant_name")
        @Expose
        private String merchantName;

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public Integer getPrice() {
            return price;
        }

        public void setPrice(Integer price) {
            this.price = price;
        }

        public Integer getQuantity() {
            return quantity;
        }

        public void setQuantity(Integer quantity) {
            this.quantity = quantity;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getBrand() {
            return brand;
        }

        public void setBrand(String brand) {
            this.brand = brand;
        }

        public String getCategory() {
            return category;
        }

        public void setCategory(String category) {
            this.category = category;
        }

        public String getMerchantName() {
            return merchantName;
        }

        public void setMerchantName(String merchantName) {
            this.merchantName = merchantName;
        }

    }

    public class CustomerDetail {

        @SerializedName("first_name")
        @Expose
        private String firstName;
        @SerializedName("last_name")
        @Expose
        private String lastName;
        @SerializedName("email")
        @Expose
        private String email;
        @SerializedName("phone")
        @Expose
        private String phone;
        @SerializedName("billing_address")
        @Expose
        private BillingAddress billingAddress;
        @SerializedName("shipping_address")
        @Expose
        private ShippingAddress shippingAddress;

        public String getFirstName() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }

        public String getLastName() {
            return lastName;
        }

        public void setLastName(String lastName) {
            this.lastName = lastName;
        }

        public String getEmail() {
            return email;
        }

        public void setEmail(String email) {
            this.email = email;
        }

        public String getPhone() {
            return phone;
        }

        public void setPhone(String phone) {
            this.phone = phone;
        }

        public BillingAddress getBillingAddress() {
            return billingAddress;
        }

        public void setBillingAddress(BillingAddress billingAddress) {
            this.billingAddress = billingAddress;
        }

        public ShippingAddress getShippingAddress() {
            return shippingAddress;
        }

        public void setShippingAddress(ShippingAddress shippingAddress) {
            this.shippingAddress = shippingAddress;
        }

        public class BillingAddress {

            @SerializedName("first_name")
            @Expose
            private String firstName;
            @SerializedName("last_name")
            @Expose
            private String lastName;
            @SerializedName("email")
            @Expose
            private String email;
            @SerializedName("phone")
            @Expose
            private String phone;
            @SerializedName("address")
            @Expose
            private String address;
            @SerializedName("city")
            @Expose
            private String city;
            @SerializedName("postal_code")
            @Expose
            private String postalCode;
            @SerializedName("country_code")
            @Expose
            private String countryCode;

            public String getFirstName() {
                return firstName;
            }

            public void setFirstName(String firstName) {
                this.firstName = firstName;
            }

            public String getLastName() {
                return lastName;
            }

            public void setLastName(String lastName) {
                this.lastName = lastName;
            }

            public String getEmail() {
                return email;
            }

            public void setEmail(String email) {
                this.email = email;
            }

            public String getPhone() {
                return phone;
            }

            public void setPhone(String phone) {
                this.phone = phone;
            }

            public String getAddress() {
                return address;
            }

            public void setAddress(String address) {
                this.address = address;
            }

            public String getCity() {
                return city;
            }

            public void setCity(String city) {
                this.city = city;
            }

            public String getPostalCode() {
                return postalCode;
            }

            public void setPostalCode(String postalCode) {
                this.postalCode = postalCode;
            }

            public String getCountryCode() {
                return countryCode;
            }

            public void setCountryCode(String countryCode) {
                this.countryCode = countryCode;
            }

        }

        public class ShippingAddress {

            @SerializedName("first_name")
            @Expose
            private String firstName;
            @SerializedName("last_name")
            @Expose
            private String lastName;
            @SerializedName("email")
            @Expose
            private String email;
            @SerializedName("phone")
            @Expose
            private String phone;
            @SerializedName("address")
            @Expose
            private String address;
            @SerializedName("city")
            @Expose
            private String city;
            @SerializedName("postal_code")
            @Expose
            private String postalCode;
            @SerializedName("country_code")
            @Expose
            private String countryCode;

            public String getFirstName() {
                return firstName;
            }

            public void setFirstName(String firstName) {
                this.firstName = firstName;
            }

            public String getLastName() {
                return lastName;
            }

            public void setLastName(String lastName) {
                this.lastName = lastName;
            }

            public String getEmail() {
                return email;
            }

            public void setEmail(String email) {
                this.email = email;
            }

            public String getPhone() {
                return phone;
            }

            public void setPhone(String phone) {
                this.phone = phone;
            }

            public String getAddress() {
                return address;
            }

            public void setAddress(String address) {
                this.address = address;
            }

            public String getCity() {
                return city;
            }

            public void setCity(String city) {
                this.city = city;
            }

            public String getPostalCode() {
                return postalCode;
            }

            public void setPostalCode(String postalCode) {
                this.postalCode = postalCode;
            }

            public String getCountryCode() {
                return countryCode;
            }

            public void setCountryCode(String countryCode) {
                this.countryCode = countryCode;
            }

        }

    }

}