Mollie integration (#3)

[mrPauwHaan]

Solves: #29 #58

Added a Mollie integration for Frappe webforms. Mollie is a big payment provider within Europe and, therefore, an essential for many SMEs who want to use Frappe for handling payments

1. This update integrates Mollie as a payment method in web forms
2. The user is automatically redirected to a checkout page to review the order, and a payment is automatically generated. It is necessary to have a field within your doctype called payment_id where the Mollie Payment ID is stored.
3. The user will be redirected to the Mollie-hosted checkout page, so you can configure any payment method within Mollie and create your own checkout.
4. When the payment is completed, the user is redirected back to the checkout page, where the payment status is automatically verified with Mollie based on the stored payment ID. When the Mollie payment link has expired, a new payment will automatically be generated on the checkout page, if the payment has not been completed yet.
5. When the payment is completed, the payment url will not be available anymore, and the user will be redirected back to the webform redirect URL.

Optional: create a payment_status field where the status of the payment is automatically stored.
Optional: Use Mollie in test mode by using the test api key in the mollie settings page. Mollie automatically recognizes it as a test payment.

[mrPauwHaan]

When will this be merged?

[torstenhoegel]

+1 for looking into this. Really important to my company for switching to erpnext

[torstenhoegel]

@trustedcomputer could you pls look into this?

[trustedcomputer]

@torstenhoegel I don't have any write access to the repository. You'll need to find a frappe maintainer to get this moving.

[torstenhoegel]

@NagariaHussain hey, could you please prioritise this? :) thx

[NagariaHussain]

Can you attach a video of the working flow?

[mrPauwHaan]

It is now also compatible with the ability to pay at other moments than only after submitting the web form. This can be used for example in the case where users have a personal account page with "outstanding payments", where you can link them to the checkout page if the payment_status is not "Completed".

Also, before todays changes the Mollie payment status was retrieved from the Mollie API, but I changed this to be overrided when the payment_status field is "Completed". This can be used for whatever reason when you want to manually change the payment_status to "Completed" (e.g. user pays via other sources).

[mrPauwHaan]

Can you attach a video of the working flow?

@NagariaHussain see the video below for the showcase. In the video, I change the payment status manually to "Completed", but obviously this happens automatically after payment

https://youtu.be/0NwQZI6wNg0

[mrPauwHaan]

@NagariaHussain @pateljannat @blaggacao when will this be merged? You can find a showcase video above

[blaggacao]

There's a refactoring going on, taking shape, being validated over at #53

I haven't updated the PR with the lastest additions and bug fixes from production operation.

I think it is worthwhile to hold back on a merge until the new api stabilizes and then refactor.

I can try to push more fixes/additions, I planned to do that anyway, but now that I know there's a stakeholder I might be even more motivated to get this done 😄

Thanks for the ping!! These are just my 2 cents from a maintenance perspective.

[blaggacao]

PS: If maintenance sharing is less of an issue, for purposes of discoverability, we could add this PR right now to the readme with a caveat. Users can then deploy from this PR/branch and can report their issues here.

Because I agree, Mollie is important in EU!

[mrPauwHaan]

@blaggacao Thank you for your extensive response. I did not know a refactor was happening, so it makes sense to await the new API. In the meantime, adding it to the readme would indeed help people who need this integration find it easier.

[blaggacao]

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