Added support for options on the Pay Invoice API

src/Stripe.net/Services/Invoices/StripeInvoicePayOptions.cs

@@ -0,0 +1,16 @@
+namespace Stripe
+{
+    using System;
+    using System.Collections.Generic;
+    using Newtonsoft.Json;
+    using Stripe.Infrastructure;
+
+    public class StripeInvoicePayOptions : StripeBaseOptions
+    {
+        [JsonProperty("forgive")]
+        public bool? Forgive { get; set; }
+
+        [JsonProperty("source")]
+        public string SourceId { get; set; }
+    }
+}

src/Stripe.net/Services/Invoices/StripeInvoiceService.cs

@@ -49,11 +49,11 @@ public virtual StripeInvoice Update(string invoiceId, StripeInvoiceUpdateOptions
                     this.SetupRequestOptions(requestOptions)));
         }
 
-        public virtual StripeInvoice Pay(string invoiceId, StripeRequestOptions requestOptions = null)
+        public virtual StripeInvoice Pay(string invoiceId, StripeInvoicePayOptions payOptions, StripeRequestOptions requestOptions = null)
         {
             return Mapper<StripeInvoice>.MapFromJson(
                 Requestor.PostString(
-                    this.ApplyAllParameters(null, $"{Urls.Invoices}/{invoiceId}/pay", false),
+                    this.ApplyAllParameters(payOptions, $"{Urls.Invoices}/{invoiceId}/pay", false),
                     this.SetupRequestOptions(requestOptions)));
         }
 
@@ -122,11 +122,11 @@ await Requestor.PostStringAsync(
                     cancellationToken).ConfigureAwait(false));
         }
 
-        public virtual async Task<StripeInvoice> PayAsync(string invoiceId, StripeRequestOptions requestOptions = null, CancellationToken cancellationToken = default(CancellationToken))
+        public virtual async Task<StripeInvoice> PayAsync(string invoiceId, StripeInvoicePayOptions payOptions, StripeRequestOptions requestOptions = null, CancellationToken cancellationToken = default(CancellationToken))
         {
             return Mapper<StripeInvoice>.MapFromJson(
                 await Requestor.PostStringAsync(
-                    this.ApplyAllParameters(null, $"{Urls.Invoices}/{invoiceId}/pay", false),
+                    this.ApplyAllParameters(payOptions, $"{Urls.Invoices}/{invoiceId}/pay", false),
                     this.SetupRequestOptions(requestOptions),
                     cancellationToken).ConfigureAwait(false));
         }

src/StripeTests/Services/Invoices/StripeInvoiceServiceTest.cs

@@ -14,6 +14,7 @@ public class StripeInvoiceServiceTest : BaseStripeTest
         private StripeInvoiceService service;
         private StripeInvoiceCreateOptions createOptions;
         private StripeInvoiceUpdateOptions updateOptions;
+        private StripeInvoicePayOptions payOptions;
         private StripeInvoiceListOptions listOptions;
         private StripeInvoiceListLineItemsOptions listLineItemsOptions;
         private StripeUpcomingInvoiceOptions upcomingOptions;
@@ -35,6 +36,12 @@ public StripeInvoiceServiceTest()
                 },
             };
 
+            this.payOptions = new StripeInvoicePayOptions()
+            {
+                Forgive = true,
+                SourceId = "src_123",
+            };
+
             this.listOptions = new StripeInvoiceListOptions()
             {
                 Limit = 1,
@@ -146,15 +153,15 @@ public async Task ListUpcomingLineItemsAsync()
         [Fact]
         public void Pay()
         {
-            var invoice = this.service.Pay(InvoiceId);
+            var invoice = this.service.Pay(InvoiceId, this.payOptions);
             Assert.NotNull(invoice);
             Assert.Equal("invoice", invoice.Object);
         }
 
         [Fact]
         public async Task PayAsync()
         {
-            var invoice = await this.service.PayAsync(InvoiceId);
+            var invoice = await this.service.PayAsync(InvoiceId, this.payOptions);
             Assert.NotNull(invoice);
             Assert.Equal("invoice", invoice.Object);
         }