diff --git a/example/lib/main.dart b/example/lib/main.dart
index e312920fe..07ad2d001 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -11,6 +11,7 @@ void main() {
   ));
 }
 
+// ignore: public_member_api_docs
 class InitialScreen extends StatefulWidget {
   @override
   State<StatefulWidget> createState() => _MyAppState();
@@ -61,6 +62,7 @@ class _MyAppState extends State<InitialScreen> {
   }
 }
 
+// ignore: public_member_api_docs
 class UpsellScreen extends StatefulWidget {
   @override
   State<StatefulWidget> createState() => _UpsellScreenState();
@@ -104,8 +106,8 @@ class _UpsellScreenState extends State<UpsellScreen> {
                   child: Column(
                 mainAxisSize: MainAxisSize.min,
                 children: <Widget>[
-                  PurchaseButton(package: monthly),
-                  PurchaseButton(package: lifetime)
+                  _PurchaseButton(package: monthly),
+                  _PurchaseButton(package: lifetime)
                 ],
               )));
         }
@@ -119,14 +121,15 @@ class _UpsellScreenState extends State<UpsellScreen> {
   }
 }
 
-class PurchaseButton extends StatelessWidget {
+class _PurchaseButton extends StatelessWidget {
   final Package package;
 
-  PurchaseButton({Key key, @required this.package}) : super(key: key);
+  // ignore: public_member_api_docs
+  _PurchaseButton({Key key, @required this.package}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    return RaisedButton(
+    return ElevatedButton(
       onPressed: () async {
         try {
           PurchaserInfo purchaserInfo =
@@ -150,6 +153,7 @@ class PurchaseButton extends StatelessWidget {
   }
 }
 
+// ignore: public_member_api_docs
 class CatsScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
diff --git a/lib/entitlement_info_wrapper.dart b/lib/entitlement_info_wrapper.dart
index 0062d9e51..c9796ff0a 100644
--- a/lib/entitlement_info_wrapper.dart
+++ b/lib/entitlement_info_wrapper.dart
@@ -46,6 +46,7 @@ class EntitlementInfo {
   /// Check the `isActive` property.
   final String billingIssueDetectedAt;
 
+  /// Construct an EntitlementInfo
   EntitlementInfo(
       this.identifier,
       this.isActive,
@@ -60,6 +61,7 @@ class EntitlementInfo {
       this.unsubscribeDetectedAt,
       this.billingIssueDetectedAt);
 
+  /// Constructs an EntitlementInfo from a JSON object
   factory EntitlementInfo.fromJson(Map<dynamic, dynamic> json) {
     var periodType;
     switch (json["periodType"] as String) {
diff --git a/lib/entitlement_infos_wrapper.dart b/lib/entitlement_infos_wrapper.dart
index 8182c286a..a0ac1709c 100644
--- a/lib/entitlement_infos_wrapper.dart
+++ b/lib/entitlement_infos_wrapper.dart
@@ -10,6 +10,7 @@ class EntitlementInfos {
   /// entitlement identifier.
   final Map<String, EntitlementInfo> active;
 
+  /// Constructs an EntitlementInfos from a JSON object
   EntitlementInfos.fromJson(Map<dynamic, dynamic> json)
       : all = (json["all"] as Map<dynamic, dynamic>).map(
             (key, value) => MapEntry(key, EntitlementInfo.fromJson(value))),
diff --git a/lib/errors.dart b/lib/errors.dart
index 58d9a23da..24191f133 100644
--- a/lib/errors.dart
+++ b/lib/errors.dart
@@ -1,27 +1,74 @@
 import 'package:flutter/services.dart';
 
+/// Different error codes returned by the Purchases functions.
 enum PurchasesErrorCode {
+  /// Unknown error
   unknownError,
+
+  /// Purchase was cancelled.
   purchaseCancelledError,
+
+  /// There was a problem with the store.
   storeProblemError,
+
+  /// The device or user is not allowed to make the purchase.
   purchaseNotAllowedError,
+
+  /// One or more of the arguments provided are invalid.
   purchaseInvalidError,
+
+  /// The product is not available for purchase.
   productNotAvailableForPurchaseError,
+
+  /// This product is already active for the user.
   productAlreadyPurchasedError,
+
+  /// There is already another active subscriber using the same receipt.
   receiptAlreadyInUseError,
+
+  /// The receipt is not valid.
   invalidReceiptError,
+
+  /// The receipt is missing.
   missingReceiptFileError,
+
+  /// Error performing request.
   networkError,
+
+  /// There was a credentials issue. Check the message for more info.
   invalidCredentialsError,
+
+  /// Received malformed response from the backend.
   unexpectedBackendResponseError,
+
+  /// There is already another active subscriber using the same receipt.
   receiptInUseByOtherSubscriberError,
+
+  /// The app user id is not valid.
   invalidAppUserIdError,
+
+  /// The operation is already in progress.
   operationAlreadyInProgressError,
+
+  /// There was an unknown backend error.
   unknownBackendError,
+
+  /// Apple Subscription Key is invalid or not present. In order to provide
+  /// subscription offers, you must first generate a subscription key. Please
+  /// see https://docs.revenuecat.com/docs/ios-subscription-offers
+  /// for more info.
   invalidAppleSubscriptionKeyError,
+
+  /// The User is ineligible for that action.
   ineligibleError,
+
+  /// App does not have sufficient permissions to make purchases.
   insufficientPermissionsError,
+
+  /// The payment is pending.
   paymentPendingError,
+
+  /// One or more of the attributes sent could not be saved.
   invalidSubscriberAttributesError
 }
 
diff --git a/lib/offering_wrapper.dart b/lib/offering_wrapper.dart
index dc33b796c..85246d845 100644
--- a/lib/offering_wrapper.dart
+++ b/lib/offering_wrapper.dart
@@ -33,6 +33,7 @@ class Offering {
   /// Weekly package type configured in the RevenueCat dashboard, if available.
   final Package weekly;
 
+  /// Constructs an Offering from a JSON object.
   Offering.fromJson(Map<dynamic, dynamic> map)
       : identifier = map["identifier"],
         serverDescription = map['serverDescription'],
diff --git a/lib/offerings_wrapper.dart b/lib/offerings_wrapper.dart
index 6e6349b91..9f258a826 100644
--- a/lib/offerings_wrapper.dart
+++ b/lib/offerings_wrapper.dart
@@ -9,6 +9,7 @@ class Offerings {
   /// Map of all Offerings [Offering] objects keyed by their identifier.
   final Map<String, Offering> all;
 
+  /// Constructs an Offerings object from a JSON object.
   Offerings.fromJson(Map<dynamic, dynamic> map)
       : current =
             map['current'] != null ? Offering.fromJson(map['current']) : null,
diff --git a/lib/package_wrapper.dart b/lib/package_wrapper.dart
index 14363c89b..6b2603a13 100644
--- a/lib/package_wrapper.dart
+++ b/lib/package_wrapper.dart
@@ -16,6 +16,7 @@ class Package {
   /// Offering this package belongs to.
   final String offeringIdentifier;
 
+  /// Constructs a Package from a JSON object.
   Package.fromJson(Map<dynamic, dynamic> json)
       : identifier = json['identifier'],
         packageType = _PackageTypeHelper.getFromString(json['packageType']),
diff --git a/lib/product_wrapper.dart b/lib/product_wrapper.dart
index 090c82441..961a08be0 100644
--- a/lib/product_wrapper.dart
+++ b/lib/product_wrapper.dart
@@ -1,5 +1,6 @@
 import 'discount.dart';
 
+/// Contains all the product details associated with a Store product id
 class Product {
   /// Product Id.
   final String identifier;
@@ -25,6 +26,7 @@ class Product {
   /// Collection of discount offers for a product. Null for Android.
   final List<Discount> discounts;
 
+  /// Constructs a Product from a JSON object.
   Product.fromJson(Map<dynamic, dynamic> json)
       : identifier = json['identifier'],
         description = json['description'],
@@ -47,6 +49,7 @@ class Product {
   }
 }
 
+/// Contains all the introductory information associated with a [Product]
 class IntroductoryPrice {
   /// Introductory price of a subscription in the local currency.
   final double introPrice;
@@ -70,6 +73,7 @@ class IntroductoryPrice {
   /// user will be given the introductory price, such as 3.
   final int introPriceCycles;
 
+  /// Constructs an IntroductoryPrice from a JSON object.
   IntroductoryPrice.fromJson(Map<dynamic, dynamic> json)
       : introPrice = json['intro_price'].toDouble(),
         introPriceString = json['intro_price_string'],
diff --git a/lib/purchaser_info_wrapper.dart b/lib/purchaser_info_wrapper.dart
index c30e6c78f..dcdc9ca35 100644
--- a/lib/purchaser_info_wrapper.dart
+++ b/lib/purchaser_info_wrapper.dart
@@ -1,6 +1,7 @@
 import 'package:purchases_flutter/entitlement_infos_wrapper.dart';
 import 'package:purchases_flutter/transaction.dart';
 
+/// Class containing all information regarding the purchaser
 class PurchaserInfo {
   /// Entitlements attached to this purchaser info
   final EntitlementInfos entitlements;
@@ -52,6 +53,7 @@ class PurchaserInfo {
   /// If there are multiple for different platforms, it will point to the device store.
   final String managementURL;
 
+  /// Constructs a PurchaserInfo from a JSON object.
   PurchaserInfo.fromJson(Map<dynamic, dynamic> map)
       : entitlements = EntitlementInfos.fromJson(
             map["entitlements"] as Map<dynamic, dynamic>),
diff --git a/lib/purchases_flutter.dart b/lib/purchases_flutter.dart
index 604ba619b..a9389de6b 100644
--- a/lib/purchases_flutter.dart
+++ b/lib/purchases_flutter.dart
@@ -7,8 +7,11 @@ import 'object_wrappers.dart';
 
 export 'object_wrappers.dart';
 
+/// Used to handle async updates from [Purchases].
+/// Should be implemented to receive updates when the [PurchaserInfo] changes.
 typedef void PurchaserInfoUpdateListener(PurchaserInfo purchaserInfo);
 
+/// Entry point for Purchases.
 class Purchases {
   static final Set<PurchaserInfoUpdateListener> _purchaserInfoUpdateListeners =
       Set();
@@ -531,18 +534,21 @@ class Purchases {
 }
 
 /// This class holds the information used when upgrading from another sku.
-///
-/// [oldSKU] The oldSKU to upgrade from.
-/// [prorationMode] The [ProrationMode] to use when upgrading the given oldSKU.
+/// To be used with purchaseProduct and purchasePackage.
 class UpgradeInfo {
+  /// The oldSKU to upgrade from.
   String oldSKU;
+
+  /// The [ProrationMode] to use when upgrading the given oldSKU.
   ProrationMode prorationMode;
 
+  /// Constructs an UpgradeInfo
   UpgradeInfo(this.oldSKU, {this.prorationMode});
 }
 
 /// Replace SKU's ProrationMode.
 enum ProrationMode {
+  /// The Upgrade or Downgrade policy is unknown.
   unknownSubscriptionUpgradeDowngradePolicy,
 
   /// Replacement takes effect immediately, and the remaining time will be
@@ -574,14 +580,27 @@ enum PurchaseType {
 
 /// Supported Attribution networks.
 enum PurchasesAttributionNetwork {
+  /// [https://searchads.apple.com/]
   appleSearchAds,
+
+  /// [https://www.adjust.com/]
   adjust,
+
+  /// [https://www.appsflyer.com/]
   appsflyer,
+
+  /// [http://branch.io/]
   branch,
+
+  /// [http://tenjin.io/]
   tenjin,
+
+  /// [https://developers.facebook.com/]
   facebook
 }
 
+/// Possible IntroEligibility status.
+/// Use [checkTrialOrIntroductoryPriceEligibility] to determine the eligibility
 enum IntroEligibilityStatus {
   /// RevenueCat doesn't have enough information to determine eligibility.
   introEligibilityStatusUnknown,
@@ -601,6 +620,7 @@ class IntroEligibility {
   /// Description of the status
   String description;
 
+  /// Constructs an Transaction from a JSON object
   IntroEligibility.fromJson(Map<dynamic, dynamic> map)
       : status = IntroEligibilityStatus.values[map["status"]],
         description = map["description"];
diff --git a/lib/transaction.dart b/lib/transaction.dart
index 7c1d858a9..a234b5d06 100644
--- a/lib/transaction.dart
+++ b/lib/transaction.dart
@@ -1,3 +1,4 @@
+/// Represents a purchase transaction
 class Transaction {
   /// RevenueCat Id associated to the transaction.
   final String revenueCatId;
@@ -8,6 +9,7 @@ class Transaction {
   /// Purchase date of the transaction in ISO 8601 format.
   final String purchaseDate;
 
+  /// Constructs an Transaction from a JSON object
   Transaction.fromJson(Map<dynamic, dynamic> map)
       : revenueCatId = map["revenueCatId"],
         productId = map["productId"],