Improve your international experience by localizing your checkout

Improve your international experience by localizing your checkout

As businesses grow internationally and acquire more foreign customers, it’s important to adjust accordingly. After all, international customers have different needs and expectations. To advance international opportunities we are now offering the option to localize your checkout.

Mollie adds Multicurrency, to advance international growth

Mollie adds Multicurrency, to advance international growth

Over the years we have been happy to continuously welcome new customers and be a part of their growing businesses. Seeing our merchants grow made us realize that, at some point, growing means internationalizing. To catalyze this internationalization we are introducing Multicurrency. A new feature, providing our customers the opportunity to grow wherever they want.

National Holiday Belgium

Because of the Belgium National Holiday all banks will be closed on Wednesday November 1st. Settlements can be created and send, but they won't be transferred to your bank account. The transfers will be done on Thursday.

Mollie launches gift cards

Today, we’re announcing the addition of a new payment method to Mollie’s products: gift cards. Starting today, all merchants who have an agreement with one or more of the supported gift card brands, can accept online gift card payments through Mollie.

Mollie currently supports the most used Dutch gift card brands: Nationale EntertainmentCard, Webshop Giftcard, Podium Cadeaukaart, VVV Giftcard and YourGift. If you are a licensed retailer for any of these issuers, integrating them into your checkout is as easy as turning on the payment method in your Dashboard Settings.

If you’re a retailer for multiple supported gift cards brands, using Mollie allows you to accept them all through a single integration.

Consumers who choose to pay for their purchases using gift cards, enter the card number and, if required, the PIN which is found on the card and might be hidden behind a scratch-off layer. Using gift cards, consumers can pay partial or full amounts. If there’s a remaining amount, another gift card of the same brand can be redeemed or any other activated payment method can be used.

As always, we only charge you for successful transactions. The cost of a successful gift card transaction is 0,25 EUR.

Not a licensed retailer yet? There’s a lot of advantages to it. The Dutch gift card industry saw a turnover of more than 2 billion EUR in 2014 And a 2015 report by the Dutch tourist office found that 41% of consumers spend more than the gift card’s worth when they redeemed it. Adding gift cards as a payment method also amplifies your reach in your specific market through exposure from the gift card issuer.

To use the gift card payment method, you’ll first need to enter into an agreement with one or more issuers. Payouts are handled by the issuers as well.

Click here for more information about the payment method.

Improvements to SEPA Bank Transfer for German consumers

Improvements to SEPA Bank Transfer for German consumers

Over the past couple of weeks, we optimised the SEPA Bank Transfer payment method for German consumers. We integrated a German IBAN, which provides improvements for both our German customers and German consumers that use this payment method. Instead of being asked to transfer funds to a foreign, in this case Dutch, bank account, they can now transfer funds to a German IBAN, which will increase trust and transaction speeds.

What do you have to do to use this German IBAN? That depends on whether you use the Mollie Checkout or use the Mollie API to generate payment details like bank account numbers and references. When using the Mollie Checkout you don’t have to do anything, our processes automatically localise the experience for your customers and use the German IBAN when relevant. If you use the Mollie API you can ensure that the German IBAN is displayed by giving the locale parameter the value de_DE when generating payments for German customers.

In 2015, we added a Belgian IBAN for Belgian consumers and noticed great improvements. We expect our customers operating in Germany will see the same.

Migrating to a new datacenter (completed)

Update: we have completed the migration to our new data center. Follow our status page to stay updated.

This change will not affect the payment services.

Somewhere in the near future, there will be a change in our network structure.

This change will mean that the webhook requests you receive, will come from new IP addresses. If you use a firewall or security plugin on your website or server, and you have whitelisted our IP addresses,  you may experience some problems . We recommend to NOT whitelist our IP addresses. The way how our API works makes this unnecessary. Whitelisting adds complexity, but no additional security.

If you still wish to whitelist our IP addresses, please add these two IP addresses to the whitelist: and Do not remove the existing IP addresses!
In case this information is too technical, or when you do not have access to the whitelist, please send this e-mail to your technical advisor.

Join Mollie at the PHPBenelux Conference 2017

Join Mollie at the PHPBenelux Conference 2017

Mollie has been the sponsor of the Dutch PHP Conference for two years now. We have since become active in the Belgian market as well and would like to bring ourselves to the attention of local developers. We regularly sponsor meet-ups, user groups and conferences. This allows us to do something for all those developers who have chosen Mollie or implemented our API.

We are therefore pleased to announce that we will be the sponsor of the PHPBenelux Conference 2017. The annual PHPBenelux Conference is a two-day event for PHP developers from Belgium, the Netherlands and Luxembourg. The event is held in the Antwerp Hotel Ter Elst, the 27th and 28th of January. Tickets are almost sold out, so be quick! 

Schermafbeelding-2016-12-20-om-10.50.42 (1)

Several of the members of our Development Team will attend both days of the conference. If you’re going to be there and would like to meet our developers, please come talk to us! You will recognize us from our Mollie shirts.

Vacancies at Mollie

We’re always looking for new colleagues. If you’d like to know more or meet up, get in touch for a cup of coffee at our offices. Interested in how we work? Check out our development blog!

From the development department: Migrating to PSR-2 at Mollie

From the development department: Migrating to PSR-2 at Mollie

At Mollie we use PHP for our back-end code. Over the years the source code style that we used was primarily based on personal preferences of team members from days of yore. For example, tabs were used for indentation, and certain PHP constants like true, false and null were written in uppercase, and we had our own little rules about where the opening brace { should go.

It is required for every developer to use the Mollie PHP code style. This helps in understanding each other’s code (reduce cognitive load), and prevents reformatting code to match own personal preferences (and any debates about that!).

To aid in sharing a common code style, the code style settings of our IDE PHPStorm are added to VCS with each project. Additionally, we use PHP_CodeSniffer from Squiz Labs, a PHP tool to check PHP source code using a set of predefined rules. This tool can also be integrated into PHPStorm to give real-time feedback about the source code in your editor.

Unfortunately, learning our proprietary coding standard took a lot of time for new developers and wasted many hours in code reviews, hours that could have been spent discussing code design or delivering value to our customers. For this reason, we decided to switch to a more established coding standard.


In 2012 the PHP Framework Interop Group (FIG) accepted two coding standard recommendations: PSR-1 and PSR-2. The PSR-2 recommendation defines a “coding style guide”, and it extends the PSR-1 “basic coding standard”. The FIG is “a group of established PHP projects whose goal is to talk about commonalities between our projects and find ways we can work better together.” (quote from their website)

Many libraries and frameworks are already using the PSR-2 coding style guide, and new ones are adapting it as well. That means that a lot of developers are getting used to writing code using the PSR-2 style.

As a Mollie developer, if you are reading a lot of code written in the PSR-2 coding style, you also want to write code using it. New developers would also become more quickly acquainted with the Mollie codebase. So we decided to use PSR-2 for our complete code base instead of hanging on to our own proprietary coding style. But that meant that we had to convert all existing code to adhere to the recommendations of the PSR-2 spec. And of course we wanted to do that automatically.


A couple of tools exist to format PHP source code. PHP_CodeSniffer has the PHP Code Beautifier and Fixer (phpcbf) that can format and fix some code styles changes. Another one is PHP-CS-Fixer by Fabien Potencier. This tool can use a format specification (like PSR-1/PSR-2), but you can also specify additional individual rules to be included or excluded during the formatting. After some tests we decided to use PHP-CS-Fixer on all of Mollie’s repositories, and use phpcbf to only fix the usage of tabs in places that PHP-CS-Fixer ignores.

The most important changes were the following:

After converting the code in a project all the unit and integration tests were run to check if nothing was broken. Next the changed files were committed using a different author than the person running the converter. We did this to distinguish the commit from other regular commits:

git commit --all --author="PSR-2 Mollie <>" -m "Convert to PSR-2"

Comparing code from previous commits (using for instance git blame) with the newly formatted PSR-2 code would of course show a lot of differences, even if you ignore whitespace. So we investigated if it was possible to convert all code from previous commits using the git filter-branch command.

With this command you can change each commit from the project history. So then you can format all code and commit it back into VCS. The downside is that each changed commit creates a new commit SHA-1 hash, which invalidates all cloned repositories. And each changed commit ideally needs to be checked with the tests. Reformatting thousands of commits would end up quite time consuming. These two arguments helped us decide not to change any code in repository's histories.


The conversion created a bit of work for all team members with older local branches. They needed to merge the tooling, then run the reformatting on their branch and then finally merge the tip of the master into their branch.

But we are very happy with the end result. A standard and well-established code style between libraries and project code help developers understand code more quicker and reduce developers' cognitive load. New developers can get up-to-speed more quickly. More time is spent on discussing code design instead of the placement of braces.

BOOKEO makes configuring Mollie easy via OAuth 2.0

Recently, BOOKEO, an online scheduling software and reservation system integrated Mollie as their preferred payment service provider for Europe. Customers of BOOKEO can now easily link their account with their merchant account at Mollie.

Screen-Shot-2016-11-28-at-11.39.42-768x841 (1)

Usually such integrations of SaaS platforms with Mollie consist of an option to use Mollie for payments and a text field for pasting your API key. However, BOOKEO implemented the integration via our OAuth 2.0 API.

Integrating your platform with Mollie via OAuth 2.0 has a number of benefits over exchanging plain API keys:

  • Merchants can link their account using the Connect with Mollie-button, there is no need to exchange API keys;
  • Privileges exchanges between Mollie and the platform are clearly visible and approved by the merchant;
  • The platform can easily switch from test- to livemode payments and can retrieve activation status from Mollie automatically;
  • Mollie can be more deeply integrated into the platform. For example, settlements can be displayed, the open balance and the next settlement date can be displayed, and any invoices from Mollie can be shown to the merchant inside your own platform;
  • Finally, OAuth 2.0 allows you to charge platform fees to the merchant through Mollie. Contact us if you would like to know more.

As you can see, integrating Mollie as a platform via OAuth 2.0 offers significant advantages. Check out our getting started guide on Mollie Connect if you would like to know more.

button-small (1)

To see how easy the integration with Mollie can be set up, you can check out the BOOKEO guide for connecting with Mollie.

Start accepting American Express payments today

Start accepting American Express payments today

American Express is one of the world’s most well-known brand names, with more than 55 million loyal cardholders across the globe. And we have good news, because as of today American Express is included in our range of payment methods!

This will enable you to focus on a larger international target group. American Express is of particular interest to those retailers focusing on the higher market segment: Amex users enjoy an above-average income and on average spend 60% percent more than holders of other credit cards.* And even though Amex is generally speaking relatively expensive for retailers, Mollie is offering this option at a uniquely competitive rate. So activate the credit card payment method in your Mollie account now and reap the benefits in the run-up to the festive season.

Reach an interesting target group

American Express-users are not just known for spending freely. A panel survey carried out by American Express earlier this year shows that Amex card holders tend to regularly return to stores that they know will accept their card. Compared to other card holders, they’re even 40% more likely to do this. So American Express users are often loyal customers.

What’s more, the Amex logo inspires trust in card holders. Many of the Amex users (40%) state that their general impression of a website or store is more positive when they see logos or pictograms indicating that their credit card is accepted.


Credit card with one push of a button

Here at Mollie we love clarity and simplicity. So with us you don’t have to submit separate applications for all the different credit cards: one action is all it takes. Activating the credit card payment method allows you to immediately receive payments via the world’s most popular credit cards: Visa, MasterCard, and now American Express as well. In addition to these familiar names, we also process payments from co-branded cards such as Dankort, CartaSi, Nordea and Carte Bancaire, and we support Maestro, V-Pay and Visa Electron.

The way in which we offer American Express is unique. A contract with Mollie is all you need to receive payments via this method. You don’t have to sign a contract with American Express and you don’t have to pay any connection charges either. There is no long waiting period because we process the application procedure internally. In most cases you can start receiving payments within one working day.


Clear and competitive rates

For accepting Amex we charge – just like for all our other payment methods – only the transaction costs. The rate for payments via American Express is identical to the costs you pay for transactions via business credit cards and credit cards issued outside of the EU:

2,8% + € 0,25 per transaction

After activating the credit card payment method in your Mollie account you can immediately start receiving payments via American Express. Not yet receiving payments via credit card? Activate this payment method in your account now and boost your turnover in the run-up to the festive season!