aviabird · oyeb · Jun 6, 2018 · May 20, 2018
diff --git a/.credo.exs b/.credo.exs
@@ -132,11 +132,7 @@
 
  # Deprecated checks (these will be deleted after a grace period)
  #
- {Credo.Check.Readability.Specs, false},
- {Credo.Check.Warning.NameRedeclarationByAssignment, false},
- {Credo.Check.Warning.NameRedeclarationByCase, false},
- {Credo.Check.Warning.NameRedeclarationByDef, false},
- {Credo.Check.Warning.NameRedeclarationByFn, false},
+ {Credo.Check.Readability.Specs, false}
 
  # Custom checks can be created using `mix credo.gen.check`.
  #

diff --git a/.scripts/post-commit b/.scripts/post-commit
@@ -7,6 +7,6 @@ RED='\033[1;31m'
 LGRAY='\033[1;30m'
 NC='\033[0m' # No Color
 
-printf "${RED}Running 'mix credo --strict --format=oneline' on project...${NC}\n"
-mix credo --strict --format=oneline
+printf "${RED}Running 'mix credo --strict' on project...${NC}\n"
+mix credo --strict
 echo
diff --git a/.travis.yml b/.travis.yml
@@ -20,10 +20,9 @@ matrix:
  - elixir: "1.5.3"
  script:
  - mix coveralls.json
- - elixir: "1.6.2"
+ - elixir: "1.6.5"
 
 notifications:
  email:
  recipients:
- - ananya95+travis@gmail.com
  - ashish+travis@aviabird.com
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,18 +1,37 @@
 # Changelog
 
+## [`v1.1.1-rc`][tag-1_1_1-rc] (2018-06-04)
+
+### Added
+
+* **core:** Remove the protocol implementation for `ex_money` since they
+ implement it for us
+ [e1cb32](https://github.com/kipcole9/money/commit/e1cb325a28a8318864ff1cbfbbb67574379a82c0)
+* **development:** Removed those annoying compiler warnings!
+* **docs:** Add docs about the money protocol.
+
+### Changed
+
+Remove support of [Wirecard](http://wirecard.com/) as we failed to implement it completely and it is
+not at all usable. It is being archived in
+[`wirecard`](https://github.com/aviabird/gringotts/tree/wirecard) branch.
+
 ## [`v1.1.0`][tag-1_1_0] (2018-04-22)
 
 ### Added
 
 * **api:** Introduces a `Money` protocol ([#71][pr#71])
-* **core:** Introduces Response.t ([#119][pr#91])
-* **development:** Adds a useful mix task gringotts.new ([#78][pr#78]) 
+* **core:** Introduces `Response.t` ([#119][pr#91])
+* **development:** Adds a useful mix task `gringotts.new` ([#78][pr#78]) to help
+ with adding more gateways!
 * **docs:** Adds changelog, contributing guide ([#117][pr#117])
 
 ### Changed
 
-* **api:** Deprecates use of `floats` for money amounts, check issue [#62][iss#62] ([#71][pr#71])
-* **core:** Removes payment worker, no application, no worker now after josevalim [pointed it][jose-feedback] ([#118][pr#118]) 
+* **api:** Deprecates use of `floats` for money amounts, check issue
+ [#62][iss#62] ([#71][pr#71])
+* **core:** Removes payment worker, no application, no worker now after
+ @josevalim [pointed it][joses-feedback] ([#118][pr#118])
 
 [iss#62]: https://github.com/aviabird/gringotts/issues/62
 [pr#71]: https://github.com/aviabird/gringotts/pulls/71
@@ -21,14 +40,13 @@
 [pr#117]: https://github.com/aviabird/gringotts/pulls/117
 [pr#78]:https://github.com/aviabird/gringotts/pulls/78
 [pr#86]:https://github.com/aviabird/gringotts/pulls/86
-[jose-feedback]:https://elixirforum.com/t/gringotts-a-complete-payment-library-for-elixir-and-phoenix-framework/11054/41
-
+[joses-feedback]:https://elixirforum.com/t/gringotts-a-complete-payment-library-for-elixir-and-phoenix-framework/11054/41
 
 ## [`v1.0.2`][tag-1_0_2] (2017-12-27)
 
 ### Added
 
-* New Gateway: **Trexle**
+* Gringotts now supports [Trexle](http://trexle.com/) as well :tada:
 
 ### Changed
 
@@ -49,12 +67,13 @@
 * **api:** Initial public API release.
 * **core:** Single worker architecture, config fetched from `config.exs`
 * **api:** Supported Gateways:
- - Stripe
- - MONEI
- - Paymill
- - WireCard
- - CAMSa
+ - [Stripe](http://stripe.com/)
+ - [MONEI](http://monei.net/)
+ - [Paymill](https://www.paymill.com/en/)
+ - [WireCard](http://wirecard.com/)
+ - [CAMS](http://www.centralams.com/)
 
+[tag-1_1_1_rc]: https://github.com/aviabird/gringotts/releases/tag/v1.1.1-rc
 [tag-1_1_0]: https://github.com/aviabird/gringotts/compare/1.1.0...1.0.2
 [tag-1_0_2]: https://github.com/aviabird/gringotts/compare/1.0.2...1.0.1
 [tag-1_0_1]: https://github.com/aviabird/gringotts/compare/1.0.1...1.0.0

diff --git a/README.md b/README.md
@@ -5,7 +5,7 @@
 </p>
 
 <p align="center">
- Gringotts is a payment processing library in Elixir integrating various payment gateways, drawing motivation for Shopify's <a href="https://github.com/activemerchant/active_merchant"><code>activemerchant</code></a> gem. Checkout the <a href="https://gringottspay.herokuapp.com/" target="_">Demo</a> here.
+ Gringotts is a payment processing library in Elixir integrating various payment gateways, drawing motivation for Shopify's <a href="https://github.com/activemerchant/active_merchant"><code>activemerchant</code></a> gem. Checkout the <a href="https://gringottspay.herokuapp.com/" target="_">demo here</a>.
 </p>
 <p align="center">
  <a href="https://travis-ci.org/aviabird/gringotts"><img src="https://travis-ci.org/aviabird/gringotts.svg?branch=master" alt='Build Status' /></a> <a href='https://coveralls.io/github/aviabird/gringotts?branch=master'><img src='https://coveralls.io/repos/github/aviabird/gringotts/badge.svg?branch=master' alt='Coverage Status' /></a> <a href=""><img src="https://img.shields.io/hexpm/v/gringotts.svg"/></a> <a href="https://inch-ci.org/github/aviabird/gringotts"><img src="http://inch-ci.org/github/aviabird/gringotts.svg?branch=master" alt="Docs coverage"></img></a> <a href="https://gitter.im/aviabird/gringotts"><img src="https://badges.gitter.im/aviabird/gringotts.svg"/></a>
@@ -25,10 +25,10 @@ Add `gringotts` to the list of dependencies of your application.
 
 def deps do
  [
- {:gringotts, "~> 1.0"},
+ {:gringotts, "~> 1.1"},
  # ex_money provides an excellent Money library, and integrates
  # out-of-the-box with Gringotts
- {:ex_money, "~> 1.1.0"}
+ {:ex_money, "> 2.5.0"}
  ]
 end
 ```
@@ -51,11 +51,12 @@ config :gringotts, Gringotts.Gateways.Monei,
  entityId: "your_secret_channel_id"
 ```
 
-Copy and paste this code in a module or an `IEx` session
+Copy and paste this code in a module or an `IEx` session, or use this handy
+[`.iex.exs`][monei-bindings] for all the bindings.
 
 ```elixir
 alias Gringotts.Gateways.Monei
-alias Gringotts.{CreditCard}
+alias Gringotts.CreditCard
 
 # a fake sample card that will work now because the Gateway is by default
 # in "test" mode.
@@ -83,18 +84,51 @@ end
 
 [hexpm]: https://hex.pm/packages/gringotts
 [monei]: http://www.monei.net
+[monei-bindings]: https://gist.github.com/oyeb/a2e2ac5986cc90a12a6136f6bf1357e5
+
+## On the `Gringotts.Money` protocol and money representation
+
+All financial applications must take proper care when representing money in
+their system. Using simple `float`ing values might lead to losses in the real
+world due to [various reasons][floating-issues].
+
+Most payment gateways are strict about the formatting of the `amount` in the
+request, hence we cannot render arbitrary floating amounts like
+`$4.99999`. Moreover, such amounts might mean something to your application but
+they don't have any value in the real world (since you can't charge someone for
+a fraction of a US cent).
+
+Your application **must round** such amounts before invoking Gringotts **and manage
+any remainders sensibly** yourself.
+
+> Gringotts may perform rounding using the [`half-even`][wiki-half-even]
+strategy, but it will discard remainders if any.
+
+### Supported "Money" libraries
+
+Gringotts does not ship with any library to work with monies. You are free to
+choose any monie library you wish, as long as they implement the
+[`Gringotts.Money`][protocol] for their type!
+
+That said, we recommend [`ex_money`][ex_money] (above [`v2.6.0`][2_6_0]) to
+represent monies. You just have to add it in your `deps()`.
+
+[protocol]: https://github.com/aviabird/gringotts/blob/dev/lib/gringotts/money.ex
+[floating-issues]: https://elixirforum.com/t/comparison-of-decimals-not-logical/770/21
+[wiki-half-even]: https://en.wikipedia.org/wiki/Rounding#Round_half_to_even
+[ex-money]: https://github.com/kipcole9/money
+[2_6_0]: https://github.com/kipcole9/money/releases/tag/v2.6.0
 
 ## Supported Gateways
 
-| Gateway | Supported countries |
-| ------ | ----- |
-| [Authorize.Net][anet] | AD, AT, AU, BE, BG, CA, CH, CY, CZ, DE, DK, ES, FI, FR, GB, GB, GI, GR, HU, IE, IT, LI, LU, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR, US, VA |
-| [CAMS][cams] | AU, US |
-| [MONEI][monei] | DE, EE, ES, FR, IT, US |
-| [PAYMILL][paymill] | AD, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FO, FR, GB, GI, GR, HU, IE, IL, IS, IT, LI, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE, SI, SK, TR, VA |
-| [Stripe][stripe] | AT, AU, BE, CA, CH, DE, DK, ES, FI, FR, GB, IE, IN, IT, LU, NL, NO, SE, SG, US |
-| [TREXLE][trexle] | AD, AE, AT, AU, BD, BE, BG, BN, CA, CH, CY, CZ, DE, DK, EE, EG, ES, FI, FR, GB, GI, GR, HK, HU, ID, IE, IL, IM, IN, IS, IT, JO, KW, LB, LI, LK, LT, LU, LV, MC, MT, MU, MV, MX, MY, NL, NO, NZ, OM, PH, PL, PT, QA, RO, SA, SE, SG, SI, SK, SM, TR, TT, UM, US, VA, VN, ZA |
-| [Wirecard][wirecard] | AD, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GI, GR, HU, IE, IL, IM, IS, IT, LI, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR, VA |
+| Gateway | PCI compliance | `purchase` | `authorize` | `capture` | `void` | `refund` | (card) `store` | (card) `unstore` |
+|-----------------------|----------------|------------|-------------|-----------|----------|----------|----------------|------------------|
+| [Authorize.Net][anet] | mandatory | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; |
+| [CAMS][cams] | mandatory | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#10060; | &#10060; |
+| [MONEI][monei] | mandatory | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#10060; |
+| [PAYMILL][paymill] | optional | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#10060; | &#10060; |
+| [Stripe][stripe] | optional | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; | &#9989; |
+| [TREXLE][trexle] | mandatory | &#9989; | &#9989; | &#9989; | &#10060; | &#9989; | &#9989; | &#10060; |
 
 [anet]: http://www.authorize.net/
 [cams]: https://www.centralams.com/
@@ -105,7 +139,7 @@ end
 [wirecard]: http://www.wirecard.com
 [demo]: https://gringottspay.herokuapp.com/
 
-## Road Map
+## [Road Map][roadmap]
 
 Apart from supporting more and more gateways, we also keep a somewhat detailed
 plan for the future on our [wiki][roadmap].
@@ -116,19 +150,6 @@ plan for the future on our [wiki][roadmap].
 
 Gringotts has a nice ring to it. Also [this][reason].
 
-#### 2. What is the worker doing in the middle?
-
-We wanted to "supervise" our payments, and power utilities to process recurring
-payments, subscriptions with it. But yes, as of now, it is a bottle neck and
-unnecessary.
-
-It's slated to be removed in [`v2.0.0`][milestone-2_0_0_alpha] and any
-supervised/async/parallel work can be explicitly managed via native elixir
-constructs.
-
-**In fact, it's already been removed from our [dev](#) branch.**
-
-[milestone-2_0_0_alpha]: https://github.com/aviabird/gringotts/milestone/3
 [reason]: http://harrypotter.wikia.com/wiki/Gringotts
 
 ## License

diff --git a/lib/gringotts.ex b/lib/gringotts.ex
@@ -9,9 +9,6 @@ defmodule Gringotts do
 
  ## Standard API arguments
 
- All requests to Gringotts are served by a supervised worker, this might be
- made optional in future releases.
-
  ### `gateway` (Module) Name
 
  The `gateway` to which this request is made. This is required in all API calls
@@ -29,24 +26,24 @@ defmodule Gringotts do
  the transaction. `amount` is polymorphic thanks to the `Gringotts.Money`
  protocol which can even be implemented by your very own custom Money type!
 
+ > Currently, we support only [`ex_money`][ex_money]'s `Money` type. Please
+ don't forget to add the `ex_money` lib to your deps!
+
  #### Note
 
  Gringotts supports [`ex_money`][ex_money] out of the box, just drop `ex_money`
  types in this argument and everything will work as expected.
 
- > Support for [`monetized`][monetized] and [`money`][money] is on the
- > way, track it [here][iss-money-lib-support]!
-
- Otherwise, just wrap your `amount` with the `currency` together in a `Map` like so,
- money = %{value: Decimal.new("100.50"), currency: "USD"}
+ > Support for [`monetized`][monetized] and [`money`][money] would be nice, but
+ is currently not planned.
 
  > When this highly precise `amount` is serialized into the network request, we
  > use a potentially lossy `Gringotts.Money.to_string/1` or
  > `Gringotts.Money.to_integer/1` to perform rounding (if required) using the
  > [`half-even`][wiki-half-even] strategy.
  >
- > **Hence, to ensure transparency, protect sanity and save _real_ money, we
- > STRONGLY RECOMMEND that merchants perform any required rounding and handle
+ > **Hence, to protect your interests, and save _real_ money, we STRONGLY
+ > RECOMMEND that (you) merchants perform any required rounding and handle
  > remainders in their application logic -- before passing the `amount` to
  > Gringotts's API.**
 
@@ -63,14 +60,23 @@ defmodule Gringotts do
  [ex_money]: https://hexdocs.pm/ex_money/readme.html
  [monetized]: https://hexdocs.pm/monetized/
  [money]: https://hexdocs.pm/money/Money.html
- [iss-money-lib-support]: https://github.com/aviabird/gringotts/projects/3#card-6801146
  [wiki-half-even]: https://en.wikipedia.org/wiki/Rounding#Round_half_to_even
 
  ### `card`, a payment source
 
- Gringotts provides a `Gringotts.CreditCard` type to hold card parameters
- which merchants fetch from their clients. The same type can also hold Debit
- card details.
+ Gringotts provides a `Gringotts.CreditCard` type to hold card parameters which
+ merchants fetch from their clients. You (the merchant) needs to be PCI-DSS
+ compliant to be able to use this.
+
+ > The same type can also hold Debit card details.
+
+ Some gateways do not provide direct API integrations even for PCI compliant
+ merchants, and force every merchant to use their client-side integration to
+ generate a card token.
+
+ Thus for such gateways, Gringotts accepts a `string` card-token instead of (or
+ in addition to) a `CreditCard.t` struct. Please refer the "Notes" section of
+ your chosen gateway to find what the card argument accepts.
 
  #### Note
 
@@ -153,9 +159,14 @@ defmodule Gringotts do
  gateway,
 
  amount = Money.new("4.2", :USD)
- # IF YOU DON'T USE ex_money
- # amount = %{value: Decimal.new("4.2"), currency: "EUR"}
- card = %Gringotts.CreditCard{first_name: "Harry", last_name: "Potter", number: "4200000000000000", year: 2099, month: 12, verification_code: "123", brand: "VISA"}
+ card = %Gringotts.CreditCard{
+ first_name: "Harry",
+ last_name: "Potter",
+ number: "4200000000000000",
+ year: 2099, month: 12,
+ verification_code: "123",
+ brand: "VISA"
+ }
  {:ok, auth_result} = Gringotts.authorize(Gringotts.Gateways.XYZ, amount, card, opts)
  """
  def authorize(gateway, amount, card, opts \\ []) do
@@ -175,10 +186,8 @@ defmodule Gringotts do
  To capture $4.20 on a previously authorized payment worth $4.20 by referencing
  the obtained authorization `id` with the `XYZ` gateway,
 
+ auth_result # The result of an `authorize/3` request.
  amount = Money.new("4.2", :USD)
- # IF YOU DON'T USE ex_money
- # amount = %{value: Decimal.new("4.2"), currency: "EUR"}
- card = %Gringotts.CreditCard{first_name: "Harry", last_name: "Potter", number: "4200000000000000", year: 2099, month: 12, verification_code: "123", brand: "VISA"}
  Gringotts.capture(Gringotts.Gateways.XYZ, amount, auth_result.id, opts)
  """
  def capture(gateway, id, amount, opts \\ []) do
@@ -204,9 +213,14 @@ defmodule Gringotts do
  To process a purchase worth $4.2, with the `XYZ` gateway,
 
  amount = Money.new("4.2", :USD)
- # IF YOU DON'T USE ex_money
- # amount = %{value: Decimal.new("4.2"), currency: "EUR"}
- card = %Gringotts.CreditCard{first_name: "Harry", last_name: "Potter", number: "4200000000000000", year: 2099, month: 12, verification_code: "123", brand: "VISA"}
+ card = %Gringotts.CreditCard{
+ first_name: "Harry",
+ last_name: "Potter",
+ number: "4200000000000000",
+ year: 2099, month: 12,
+ verification_code: "123",
+ brand: "VISA"
+ }
  Gringotts.purchase(Gringotts.Gateways.XYZ, amount, card, opts)
  """
  def purchase(gateway, amount, card, opts \\ []) do
@@ -225,8 +239,6 @@ defmodule Gringotts do
  gateway,
 
  amount = Money.new("4.2", :USD)
- # IF YOU DON'T USE ex_money
- # amount = %{value: Decimal.new("4.2"), currency: "EUR"}
  Gringotts.purchase(Gringotts.Gateways.XYZ, amount, id, opts)
  """
  def refund(gateway, amount, id, opts \\ []) do
@@ -237,7 +249,7 @@ defmodule Gringotts do
  @doc """
  Stores the payment-source data for later use, returns a `token`.
 
- > The token must be returned in the `Response.authorization` field.
+ > The token must be returned in the `Response.token` field.
 
  ## Note
 
@@ -247,7 +259,14 @@ defmodule Gringotts do
 
  To store a card (a payment-source) for future use, with the `XYZ` gateway,
 
- card = %Gringotts.CreditCard{first_name: "Jo", last_name: "Doe", number: "4200000000000000", year: 2099, month: 12, verification_code: "123", brand: "VISA"}
+ card = %Gringotts.CreditCard{
+ first_name: "Harry",
+ last_name: "Potter",
+ number: "4200000000000000",
+ year: 2099, month: 12,
+ verification_code: "123",
+ brand: "VISA"
+ }
  Gringotts.store(Gringotts.Gateways.XYZ, card, opts)
  """
  def store(gateway, card, opts \\ []) do