refactor: clarify architecture, implement PayZen & implement Wompi

[blaggacao]

ERP Companion: frappe/erpnext#40845 🟢

Frappe Companion: frappe/frappe#25952 ✔️ & frappe/frappe#26324 ✔️ & frappe/frappe#26637 ✔️

closes #52

Rendered

@s-aga-r @ankush please let me know what you think of this direction.

• Merge Frappe Hook update feat: add new payment processing hooks frappe#25952
  • Ensure it is fully backwards compatible
• Merge ERPNext preparation feat: enable a new payment controller erpnext#40845
  • Implement ERPNext dispatcher for new and old version gateways on Payment Request
  • Ensure it is fully backwards compatible
• Revise docs (now that the implementation is almost finished) - special note: how to implemeten payment sessions for webshop in the future
• cleanup old payzen implementation
• cleanup commit history
• add wompi implementation
• write unit tests (new controller, wompi & payzen)
• Investigate impact of frappe/frappe@59ca074 cc @akhilnarang (removal of response.raise_for_status())

* This implementation is quite eagerly typed to aid with IDE support when implementing a new gateway.

** Walk through screenshots: #53 (comment)

Overview

[blaggacao]

Some Noetes to self

[blaggacao]

Fears are nothing more than a state of mind. - Napoleon Hill

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

What the caterpillar calls the end of the world, the master calls a butterfly. - Richard Bach

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

Watch your thoughts, they become your words Watch your words, they become your actions Watch your actions, they become your habits Watch your habits, they become your character Watch your character, it becomes your destiny. -

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

You may say Im a dreamer, but Im not the only one, I hope someday you will join us, and the world will live as one. - John Lennon

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures. - Lao Tzu

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

The important thing is this: to be able at any moment to sacrifice what we are for what we could become. - Charles Dubois

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

Obstacles are those frightful things you see when you take your eyes off your goal. - Henry Ford

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

Our distrust is very expensive. - Ralph Emerson

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[blaggacao]

An invincible determination can accomplish almost anything and in this lies the great distinction between great men and little men. - Thomas Fuller

---

_{Kindly help move this PR forward. Many thanks from Yours Sincerely!}

[torstenhoegel]

@blaggacao what's the state with this? really looking forward to mollie implementation but this seems to block it, right?

[blaggacao]

@torstenhoegel I've been running an evolution of this in production successfully for over half a year now. The work ahead is some elaborate rebasing and cherry picking from that branch, improve test coverage and proceed with polishing and stabilization of the api + a compatibility layer inside erpnext to work with the new gateways.

[torstenhoegel]

Thanks a lot for the update @blaggacao and for your continued work on this! It’s great to hear that it's been running smoothly in production for so long.

I was wondering, do you have a rough timeline in mind for when the rebasing, test coverage improvements, and the API stabilization might be ready for release? No rush, just curious about when it might be expected.

Thanks again for all your efforts!

[blaggacao]

I hope we'd be measuring weeks not months, though it's not at the top of my priority lust, at this moment. But it didn't fall off, either. 😄