diff --git a/.env.example b/.env.example
index 0b4d765..6c5df95 100644
--- a/.env.example
+++ b/.env.example
@@ -2,4 +2,7 @@
 STRIPE_TEST_SECRET_KEY=
 
 # A Stripe account that is already connected to the account above.
+# You can create a new test connected account from the "connected accounts"
+# section of the dashboard.  Create type "standard" and follow the link to skip
+# all verification steps.
 STRIPE_CONNECTED_ACCOUNT_ID=
diff --git a/README.md b/README.md
index d983908..d468a3e 100644
--- a/README.md
+++ b/README.md
@@ -7,13 +7,13 @@ Simulates a stateful Stripe server for local unit testing.  Makes Stripe calls 5
 Supported features:
 - charges: create with the most common [test tokens](https://stripe.com/docs/testing) or customer card, retrieve, list, update, capture
 - refunds: create, retrieve, list
-- customers: create, retrieve, list, update, create card, retrieve card, delete card
+- customers: create, retrieve, update, list, create card, retrieve card, delete card
 - products: create, retrieve, list
 - plans: create, retrieve, list
 - prices: create, retrieve, update, list
 - subscriptions: create, retrieve, list
-- tax plans: create, retrieve, list, update
-- connect accounts: create and delete
+- tax plans: create, retrieve, update, list
+- connect accounts: create, delete
 - idempotency
 
 Correctness of this test server is not guaranteed!  Set up unit testing to work against either the Stripe server with a test account or this mock server with a flag to switch between them.  Test against the official Stripe server occasionally to ensure correctness on the fine details.
diff --git a/package-lock.json b/package-lock.json
index 82afc7e..e1e9627 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -44,9 +44,9 @@
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+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.2.1.tgz",
+      "integrity": "sha512-XRUeBZ5zBWLYgSANMpThFddrZZkEbGHgUdt5UJjZfnlN9BGCiUBrf+nvbRupSjMvqzwnQN0qwCmOxITt1cfywA==",
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+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
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+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.14.tgz",
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       "dev": true
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@@ -144,12 +144,6 @@
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@@ -175,9 +169,9 @@
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+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.9.tgz",
+      "integrity": "sha512-SDzEIZInC4sivGIFY4Sz1GG6J9UObPwCInYJjko2jzOf/Imx/dlpume6Xxwj1ORL82tBbmN4cPDIDkLbWHk9hw==",
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@@ -187,9 +181,9 @@
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+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.13.tgz",
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@@ -243,23 +237,23 @@
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-        "@types/express-serve-static-core": "*",
-        "@types/mime": "*"
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@@ -2904,9 +2841,9 @@
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
     },
     "v8-compile-cache": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.1.tgz",
-      "integrity": "sha512-8OQ9CL+VWyt3JStj7HX7/ciTL2V3Rl1Wf5OL+SNTm0yK1KvtReVulksyeRnCANHHuUxHlQig+JJDlUhBt1NQDQ==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
+      "integrity": "sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q==",
       "dev": true
     },
     "vary": {
@@ -3015,9 +2952,9 @@
       "dev": true
     },
     "workerpool": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.0.tgz",
-      "integrity": "sha512-fU2OcNA/GVAJLLyKUoHkAgIhKb0JoCpSjLC/G2vYKxUjVmQwGbRVeoPJ1a8U4pnVofz4AQV5Y/NEw8oKqxEBtA==",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.2.tgz",
+      "integrity": "sha512-DSNyvOpFKrNusaaUwk+ej6cBj1bmhLcBfj80elGk+ZIo5JSkq+unB1dLKEOcNfJDZgjGICfhQ0Q5TbP0PvF4+Q==",
       "dev": true
     },
     "wrap-ansi": {
@@ -3143,89 +3080,28 @@
       }
     },
     "yargs-unparser": {
-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
-      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
       "dev": true,
       "requires": {
-        "camelcase": "^5.3.1",
-        "decamelize": "^1.2.0",
-        "flat": "^4.1.0",
-        "is-plain-obj": "^1.1.0",
-        "yargs": "^14.2.3"
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
       },
       "dependencies": {
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
-        },
-        "locate-path": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
-          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
-          "dev": true,
-          "requires": {
-            "p-locate": "^3.0.0",
-            "path-exists": "^3.0.0"
-          }
-        },
-        "p-limit": {
-          "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
-          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
-          "dev": true,
-          "requires": {
-            "p-try": "^2.0.0"
-          }
-        },
-        "p-locate": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
-          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
-          "dev": true,
-          "requires": {
-            "p-limit": "^2.0.0"
-          }
-        },
-        "path-exists": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
-          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+        "camelcase": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
+          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
           "dev": true
         },
-        "yargs": {
-          "version": "14.2.3",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
-          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
-          "dev": true,
-          "requires": {
-            "cliui": "^5.0.0",
-            "decamelize": "^1.2.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^2.0.1",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^2.0.0",
-            "set-blocking": "^2.0.0",
-            "string-width": "^3.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^4.0.0",
-            "yargs-parser": "^15.0.1"
-          }
-        },
-        "yargs-parser": {
-          "version": "15.0.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
-          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
+          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
+          "dev": true
         }
       }
     },
diff --git a/package.json b/package.json
index cc9c077..39b83df 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "stripe-stateful-mock",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "description": "A half-baked, stateful Stripe mock server",
   "main": "dist/index.js",
   "scripts": {
@@ -43,23 +43,23 @@
   "devDependencies": {
     "@types/basic-auth": "^1.1.3",
     "@types/body-parser": "^1.19.0",
-    "@types/chai": "^4.2.13",
+    "@types/chai": "^4.2.14",
     "@types/chai-as-promised": "^7.1.3",
     "@types/deep-equal": "^1.0.1",
     "@types/dotenv-safe": "^8.1.1",
-    "@types/express": "^4.17.8",
+    "@types/express": "^4.17.9",
     "@types/loglevel": "^1.6.3",
-    "@types/mocha": "^8.0.3",
-    "@typescript-eslint/eslint-plugin": "^4.4.0",
-    "@typescript-eslint/parser": "^4.4.0",
+    "@types/mocha": "^8.0.4",
+    "@typescript-eslint/eslint-plugin": "^4.8.1",
+    "@typescript-eslint/parser": "^4.8.1",
     "chai": "^4.2.0",
     "chai-exclude": "^2.0.2",
     "dotenv-safe": "^8.2.0",
-    "eslint": "^7.10.0",
-    "mocha": "^8.1.3",
+    "eslint": "^7.13.0",
+    "mocha": "^8.2.1",
     "rimraf": "^3.0.2",
-    "stripe": "^8.92.0",
+    "stripe": "^8.125.0",
     "ts-node": "^9.0.0",
-    "typescript": "^4.0.3"
+    "typescript": "^4.1.2"
   }
 }
diff --git a/src/api/charges.ts b/src/api/charges.ts
index 4971cd5..dfcbc6c 100644
--- a/src/api/charges.ts
+++ b/src/api/charges.ts
@@ -236,6 +236,7 @@ export namespace charges {
         } else {
             charge.captured = true;
         }
+        charge.amount_captured += captureAmount;
         charge.balance_transaction = "txn_" + generateId(24);
 
         return charge;
@@ -243,10 +244,12 @@ export namespace charges {
 
     function getChargeFromCard(params: Stripe.ChargeCreateParams, source: Stripe.Card): Stripe.Charge {
         const chargeId = "ch_" + generateId();
+        const captured = params.capture as any !== "false";
         return {
             id: chargeId,
             object: "charge",
             amount: +params.amount,
+            amount_captured: captured ? +params.amount : 0,
             amount_refunded: 0,
             application: null,
             application_fee: null,
@@ -266,7 +269,7 @@ export namespace charges {
                 phone: null
             },
             calculated_statement_descriptor: null,
-            captured: params.capture as any !== "false",
+            captured: captured,
             created: (Date.now() / 1000) | 0,
             currency: params.currency.toLowerCase(),
             customer: null,
@@ -525,8 +528,8 @@ export namespace charges {
         }
     }
 
-    export function getShippingFromParams(params: Stripe.ChargeUpdateParams.Shipping | null): Stripe.Charge.Shipping | null {
-        if (params == null) {
+    export function getShippingFromParams(params: Stripe.ChargeUpdateParams.Shipping | "" | null): Stripe.Charge.Shipping | null {
+        if (params == null || params === "") {
             return null;
         }
 
@@ -539,8 +542,8 @@ export namespace charges {
         };
     }
 
-    export function getAddressFromParams(params: Stripe.AddressParam | null): Stripe.Address | null {
-        if (params == null) {
+    export function getAddressFromParams(params: Stripe.AddressParam | "" | null): Stripe.Address | null {
+        if (params == null || params === "") {
             return null;
         }
 
diff --git a/src/api/customers.ts b/src/api/customers.ts
index dc92354..148ae89 100644
--- a/src/api/customers.ts
+++ b/src/api/customers.ts
@@ -166,7 +166,7 @@ export namespace customers {
             createCard(accountId, customer, {source: params.source});
         }
         if (params.tax_exempt !== undefined) {
-            customer.tax_exempt = params.tax_exempt;
+            customer.tax_exempt = params.tax_exempt || null;
         }
 
         return expandObject(
diff --git a/src/api/subscriptions.ts b/src/api/subscriptions.ts
index b38d27b..228e35e 100644
--- a/src/api/subscriptions.ts
+++ b/src/api/subscriptions.ts
@@ -64,7 +64,7 @@ export namespace subscriptions {
             days_until_due: +params.days_until_due || null,
             default_payment_method: null,
             default_source: default_source || null,
-            default_tax_rates: params.default_tax_rates?.map(t => taxRates.retrieve(accountId, t, "default_tax_rate")),
+            default_tax_rates: (params.default_tax_rates || null)?.map(t => taxRates.retrieve(accountId, t, "default_tax_rate")),
             discount: null,
             ended_at: null,
             items: {
@@ -132,7 +132,7 @@ export namespace subscriptions {
         const subscriptionItem: Stripe.SubscriptionItem = {
             object: "subscription_item",
             id: subItemId,
-            billing_thresholds: item.billing_thresholds ?? null,
+            billing_thresholds: item.billing_thresholds || null,
             created: Math.floor(Date.now() / 1000),
             deleted: undefined,
             metadata: stringifyMetadata(item.metadata),
@@ -140,7 +140,7 @@ export namespace subscriptions {
             price: item.price ? prices.retrieve(accountId, item.price, "price") : null,
             quantity: +item.quantity || 1,
             subscription: subscriptionId,
-            tax_rates: item.tax_rates?.map(r => taxRates.retrieve(accountId, r, "tax_rate"))
+            tax_rates: (item.tax_rates || null)?.map(r => taxRates.retrieve(accountId, r, "tax_rate"))
         };
         accountSubscriptionItems.put(accountId, subscriptionItem);
 
diff --git a/src/api/utils.ts b/src/api/utils.ts
index c525cae..b9edd75 100644
--- a/src/api/utils.ts
+++ b/src/api/utils.ts
@@ -5,7 +5,7 @@ export function generateId(length: number = 20): string {
     return new Array(length).fill("5").map(() => chars[(Math.random() * chars.length) | 0]).join("");
 }
 
-export function stringifyMetadata(metadata?: { [key: string]: string | number }): { [key: string]: string } {
+export function stringifyMetadata(metadata?: { [key: string]: string | number } | ""): { [key: string]: string } {
     if (!metadata) {
         return {};
     }
diff --git a/test/charges.ts b/test/charges.ts
index 5d5c68e..3c8515e 100644
--- a/test/charges.ts
+++ b/test/charges.ts
@@ -195,11 +195,18 @@ describe("charges", () => {
         }
     ));
 
+    it("supports on_behalf_of", buildChargeParityTest({
+        amount: 3500,
+        currency: "usd",
+        on_behalf_of: process.env["STRIPE_CONNECTED_ACCOUNT_ID"],
+        source: "tok_visa",
+        transfer_group: "xfer"
+    }));
+
     it("supports misc additional params", buildChargeParityTest({
         amount: 3500,
         description: "this is a description",
         currency: "usd",
-        on_behalf_of: process.env["STRIPE_CONNECTED_ACCOUNT_ID"],
         receipt_email: "foobar@example.com",
         shipping: {
             address: {
@@ -217,8 +224,7 @@ describe("charges", () => {
             tracking_number: "abc123"
         },
         source: "tok_visa",
-        statement_descriptor: "ccc",
-        transfer_group: "ddd"
+        statement_descriptor: "hello world",
     }));
 
     it("supports upper case currency", buildStripeParityTest(
diff --git a/test/stripeAssert.ts b/test/stripeAssert.ts
index e418035..e36c50a 100644
--- a/test/stripeAssert.ts
+++ b/test/stripeAssert.ts
@@ -132,6 +132,7 @@ export function assertChargesAreBasicallyEqual(actual: Stripe.Charge, expected:
     assertEqualOnKeys(actual, expected, [
         "object",
         "amount",
+        "amount_captured",
         "amount_refunded",
         "application_fee",
         "application_fee_amount",