Add coinbase payin support

[rohitpaulk]

Work in progess.

This is a redo of #2053

This pull request is too big. Gittip can only chew things in small bites. We need to break this up into smaller PRs.

• Add UI to link coinbase account
• Store coinbase result in DB
• Set is_funded correctly by including last_coinbase_result too in participant.py.
• Same as above, in fake_payday.sql
• What are the fees for coinbase transactions?
• Modify payday to first try a credit card, and then a coinbase account if that fails. If Add a funding rules UI #2299 lands before this, this will have to include changes from there.
• Modify the missing credit card warnings to display coinbase as an option.
• Update docs/about/faq wherever needed.

[chadwhitacre]

Thanks for taking the initiative on this, @rohitpaulk. We need to decide whether we're going to use Balanced's Coinbase integration, or use Coinbase directly. I'm inclined towards the latter, but we should tease out the implications of both options and make a decision.

[rohitpaulk]

@whit537 - I saw #2053 still open, so assumed that we'd decided to go the balanced+coinbase way.

Let's discuss this on IRC sometime and we'll make a final decision :)

[rohitpaulk]

IRC

[rohitpaulk]

From balanced support via email:

Sorry for the delay. I'm checking on the pricing with Matin our CEO now.

[rohitpaulk]

Okay, fees confirmed.

It'll be 1% only, not 1% + 15¢.

[techtonik]

Is there a table of all fees on incoming/outgoing flow?

I thought that https://gratipay.com/about/pricing is about price of money move and donation (more like the price you pay for receiving/donating money), but it is just about Gratipay asking for money.

[rohitpaulk]

@techtonik - https://gratipay.com/about/faq.html#how-add-funds

[techtonik]

@rohitpaulk thanks, just what I need. And yes, this request is too big. =)

[chadwhitacre]

+1 from https://gratipay.freshdesk.com/helpdesk/tickets/1438.

[seanlinsley]

It doesn't look like this has been worked in a while, so I'm marking it as stalled.

[rohitpaulk]

I'd like to work on this, but I'll need help on integrating the coinbase calls into payday. #2914 was a step in this direction, I'm not sure what's next.

cc: @Changaco

[Changaco]

I didn't know this was waiting for me. This PR has the same problems as #2824. We don't want to keep adding columns like last_coinbase_result to participants. We need to generalize the code to handle any number of payment methods. I already have a local branch for that but I haven't done much work on it yet.

[techtonik]

We don't want to keep adding columns like last_coinbase_result to
participants.

Does anybody use tools to see (or dump) the current structure of DB
visually? Some time ago looked for some command line tool that outputs into
.png in a predictable way, but didn't find any that worked for me.

[rohitpaulk]

I didn't know this was waiting for me.

That's my fault, I should've asked you once more after we implemented #2914.

We need to generalize the code to handle any number of payment methods.

Yes, that makes sense.

[rohitpaulk]

Closing this (#3245).