public static Payment CreatePayment(string baseUrl, string intent)
{
// ### Api Context
// Pass in a `APIContext` object to authenticate
// the call and to send a unique request id
// (that ensures idempotency). The SDK generates
// a request id if you do not pass one explicitly.
var apiContext = PayPalConfiguration.GetAPIContext();
// Payment Resource
var payment = new Payment()
{
intent = intent, // `sale` or `authorize`
payer = new Payer() { payment_method = "paypal" },
transactions = GetTransactionsList(),
redirect_urls = GetReturnUrls(baseUrl, intent)
};
// Create a payment using a valid APIContext
var createdPayment = payment.Create(apiContext);
return createdPayment;
}
private static List<Transaction> GetTransactionsList()
{
// A transaction defines the contract of a payment
// what is the payment for and who is fulfilling it.
var transactionList = new List<Transaction>();
// The Payment creation API requires a list of Transaction;
// add the created Transaction to a List
transactionList.Add(new Transaction()
{
description = "Transaction description.",
invoice_number = GetRandomInvoiceNumber(),
amount = new Amount()
{
currency = "USD",
total = "100.00", // Total must be equal to sum of shipping, tax and subtotal.
details = new Details() // Details: Let's you specify details of a payment amount.
{
tax = "15",
shipping = "10",
subtotal = "75"
}
},
item_list = new ItemList()
{
items = new List<Item>()
{
new Item()
{
name = "Item Name",
currency = "USD",
price = "15",
quantity = "5",
sku = "sku"
}
}
}
});
return transactionList;
}
private static RedirectUrls GetReturnUrls(string baseUrl, string intent)
{
var returnUrl = intent == "sale" ? "/Home/PaymentSuccessful" : "/Home/AuthorizeSuccessful";
// Redirect URLS
// These URLs will determine how the user is redirected from PayPal
// once they have either approved or canceled the payment.
return new RedirectUrls()
{
cancel_url = baseUrl + "/Home/PaymentCancelled",
return_url = baseUrl + returnUrl
};
}
public static Payment ExecutePayment(string paymentId, string payerId)
{
// ### Api Context
// Pass in a `APIContext` object to authenticate
// the call and to send a unique request id
// (that ensures idempotency). The SDK generates
// a request id if you do not pass one explicitly.
var apiContext = PayPalConfiguration.GetAPIContext();
var paymentExecution = new PaymentExecution() { payer_id = payerId };
var payment = new Payment() { id = paymentId };
// Execute the payment.
var executedPayment = payment.Execute(apiContext, paymentExecution);
return executedPayment;
}
public static Capture CapturePayment(string paymentId)
{
var apiContext = PayPalConfiguration.GetAPIContext();
var payment = Payment.Get(apiContext, paymentId);
var auth = payment.transactions[0].related_resources[0].authorization;
// Specify an amount to capture. By setting 'is_final_capture' to true, all remaining funds held by the authorization will be released from the funding instrument.
var capture = new Capture()
{
amount = new Amount()
{
currency = "USD",
total = "4.54"
},
is_final_capture = true
};
// Capture an authorized payment by POSTing to
// URI v1/payments/authorization/{authorization_id}/capture
var responseCapture = auth.Capture(apiContext, capture);
return responseCapture;
}
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然後，我在 HomeController 中新增了兩個新操作來顯示此類付款：
public IActionResult AuthorizePayment()
{
var payment = PayPalPaymentService.CreatePayment(GetBaseUrl(), "authorize");
return Redirect(payment.GetApprovalUrl());
}
public IActionResult AuthorizeSuccessful(string paymentId, string token, string PayerID)
{
// Capture Payment
var capture = PayPalPaymentService.CapturePayment(paymentId);
return View();
}
// Define the plan and attach the payment definitions and merchant preferences.
// More Information: https://developer.paypal.com/webapps/developer/docs/api/#create-a-plan
var billingPlan = new Plan
{
name = "Tuts+ Plus",
description = "Monthly plan for courses.",
type = "fixed",
// Define the merchant preferences.
// More Information: https://developer.paypal.com/webapps/developer/docs/api/#merchantpreferences-object
merchant_preferences = new MerchantPreferences()
{
setup_fee = GetCurrency("0"), // $0
return_url = "returnURL", // Retrieve from config
cancel_url = "cancelURL", // Retrieve from config
auto_bill_amount = "YES",
initial_fail_amount_action = "CONTINUE",
max_fail_attempts = "0"
},
payment_definitions = new List<PaymentDefinition>
{
// Define a trial plan that will only charge $9.99 for the first
// month. After that, the standard plan will take over for the
// remaining 11 months of the year.
new PaymentDefinition()
{
name = "Trial Plan",
type = "TRIAL",
frequency = "MONTH",
frequency_interval = "1",
amount = GetCurrency("0"), // Free for the 1st month
cycles = "1",
charge_models = new List<ChargeModel>
{
new ChargeModel()
{
type = "TAX",
amount = GetCurrency("1.65") // If we need to charge Tax
},
new ChargeModel()
{
type = "SHIPPING",
amount = GetCurrency("9.99") // If we need to charge for Shipping
}
}
},
// Define the standard payment plan. It will represent a monthly
// plan for $19.99 USD that charges once month for 11 months.
new PaymentDefinition
{
name = "Standard Plan",
type = "REGULAR",
frequency = "MONTH",
frequency_interval = "1",
amount = GetCurrency("15.00"),
// > NOTE: For `IFNINITE` type plans, `cycles` should be 0 for a `REGULAR` `PaymentDefinition` object.
cycles = "11",
charge_models = new List<ChargeModel>
{
new ChargeModel
{
type = "TAX",
amount = GetCurrency("2.47")
},
new ChargeModel()
{
type = "SHIPPING",
amount = GetCurrency("9.99")
}
}
}
}
};
// Get PayPal Config
var apiContext = PayPalConfiguration.GetAPIContext();
// Create Plan
plan.Create(apiContext);
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新创建的结算计划处于 CREATED 状态。将其激活为“活动”状态，以便您的客户可以订阅该计划。要激活该计划，我们需要发出 PATCH 请求：
// Activate the plan
var patchRequest = new PatchRequest()
{
new Patch()
{
op = "replace",
path = "/",
value = new Plan() { state = "ACTIVE" }
}
};
plan.Update(apiContext, patchRequest);
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如您所见，PayPal 库是其 REST API 的直接包装器，这很好，但与 Stripe 等其他 API 相比，该 API 也非常复杂。因此，将所有 PayPal 通信包装在对象中，为我们的应用程序提供更清晰、更简单的 API，这确实是一个不错的选择。在这里您可以看到封装在多个带有参数的函数中的代码的样子：
public static Plan CreatePlanObject(string planName, string planDescription, string returnUrl, string cancelUrl,
string frequency, int frequencyInterval, decimal planPrice,
decimal shippingAmount = 0, decimal taxPercentage = 0, bool trial = false, int trialLength = 0, decimal trialPrice = 0)
{
// Define the plan and attach the payment definitions and merchant preferences.
// More Information: https://developer.paypal.com/docs/rest/api/payments.billing-plans/
return new Plan
{
name = planName,
description = planDescription,
type = PlanType.Fixed,
// Define the merchant preferences.
// More Information: https://developer.paypal.com/webapps/developer/docs/api/#merchantpreferences-object
merchant_preferences = new MerchantPreferences()
{
setup_fee = GetCurrency("1"),
return_url = returnUrl,
cancel_url = cancelUrl,
auto_bill_amount = "YES",
initial_fail_amount_action = "CONTINUE",
max_fail_attempts = "0"
},
payment_definitions = GetPaymentDefinitions(trial, trialLength, trialPrice, frequency, frequencyInterval, planPrice, shippingAmount, taxPercentage)
};
}
private static List<PaymentDefinition> GetPaymentDefinitions(bool trial, int trialLength, decimal trialPrice,
string frequency, int frequencyInterval, decimal planPrice, decimal shippingAmount, decimal taxPercentage)
{
var paymentDefinitions = new List<PaymentDefinition>();
if (trial)
{
// Define a trial plan that will charge 'trialPrice' for 'trialLength'
// After that, the standard plan will take over.
paymentDefinitions.Add(
new PaymentDefinition()
{
name = "Trial",
type = "TRIAL",
frequency = frequency,
frequency_interval = frequencyInterval.ToString(),
amount = GetCurrency(trialPrice.ToString()),
cycles = trialLength.ToString(),
charge_models = GetChargeModels(trialPrice, shippingAmount, taxPercentage)
});
}
// Define the standard payment plan. It will represent a 'frequency' (monthly, etc)
// plan for 'planPrice' that charges 'planPrice' (once a month) for #cycles.
var regularPayment = new PaymentDefinition
{
name = "Standard Plan",
type = "REGULAR",
frequency = frequency,
frequency_interval = frequencyInterval.ToString(),
amount = GetCurrency(planPrice.ToString()),
// > NOTE: For `IFNINITE` type plans, `cycles` should be 0 for a `REGULAR` `PaymentDefinition` object.
cycles = "11",
charge_models = GetChargeModels(trialPrice, shippingAmount, taxPercentage)
};
paymentDefinitions.Add(regularPayment);
return paymentDefinitions;
}
private static List<ChargeModel> GetChargeModels(decimal planPrice, decimal shippingAmount, decimal taxPercentage)
{
// Create the Billing Plan
var chargeModels = new List<ChargeModel>();
if (shippingAmount > 0)
{
chargeModels.Add(new ChargeModel()
{
type = "SHIPPING",
amount = GetCurrency(shippingAmount.ToString())
});
}
if (taxPercentage > 0)
{
chargeModels.Add(new ChargeModel()
{
type = "TAX",
amount = GetCurrency(String.Format("{0:f2}", planPrice * taxPercentage / 100))
});
}
return chargeModels;
}
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更新结算计划
您可以通过提出“PATCH”请求来更新现有结算方案的信息。这是一个包装该调用的函数：
public static void UpdateBillingPlan(string planId, string path, object value)
{
// PayPal Authentication tokens
var apiContext = PayPalConfiguration.GetAPIContext();
// Retrieve Plan
var plan = Plan.Get(apiContext, planId);
// Activate the plan
var patchRequest = new PatchRequest()
{
new Patch()
{
op = "replace",
path = path,
value = value
}
};
plan.Update(apiContext, patchRequest);
}
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要更新计费计划描述，我们可以调用此函数并传递正确的参数：
UpdateBillingPlan(
planId: "P-5FY40070P6526045UHFWUVEI",
path: "/",
value: new Plan { description = "new description" });
public static void ExecuteBillingAgreement(string token)
{
// PayPal Authentication tokens
var apiContext = PayPalConfiguration.GetAPIContext();
var agreement = new Agreement() { token = token };
var executedAgreement = agreement.Execute(apiContext);
}
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暂停计费协议
使用此方法暂停协议：
public static void SuspendBillingAgreement(string agreementId)
{
var apiContext = PayPalConfiguration.GetAPIContext();
var agreement = new Agreement() { id = agreementId };
agreement.Suspend(apiContext, new AgreementStateDescriptor()
{ note = "Suspending the agreement" });
}
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重新激活计费协议
这个与上一个非常相似：
public static void ReactivateBillingAgreement(string agreementId)
{
var apiContext = PayPalConfiguration.GetAPIContext();
var agreement = new Agreement() { id = agreementId };
agreement.ReActivate(apiContext, new AgreementStateDescriptor()
{ note = "Reactivating the agreement" });
}
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取消计费协议
使用此功能取消计划：
public static void CancelBillingAgreement(string agreementId)
{
var apiContext = PayPalConfiguration.GetAPIContext();
var agreement = new Agreement() { id = agreementId };
agreement.Cancel(apiContext, new AgreementStateDescriptor()
{ note = "Cancelling the agreement" });
}
