fix: Configure PayPal for mobile payments

[anhanh11001]

Fixes: #6405

Related Issue:
fossasia/open-event-attendee-android#2223

[anhanh11001]

@iamareebjamal please review

[iamareebjamal]

Have you tested it to be working with settings?

[anhanh11001]

I haven't cause I still don't know where to put the client ID and secret. I just follow the implementation from the function above. Where should I put it?

[iamareebjamal]

See settings API

[anhanh11001]

Sorry for the long response but I'm having a problem reinstalling my environment (pycrypto). I'll try to see if I can get my env installed again and hopefully can have it tested today. Here is something I read on Github, maybe it would be helpful in the future: pycrypto/pycrypto#238

[iamareebjamal]

You can use deps-pycryptodome branch

[codecov]

Codecov Report

Merging #6406 into development will decrease coverage by <.01%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##           development   #6406      +/-   ##
==============================================
- Coverage         64.9%   64.9%   -0.01%     
==============================================
  Files              288     288              
  Lines            14911   14912       +1     
==============================================
  Hits              9678    9678              
- Misses            5233    5234       +1

Impacted Files	Coverage Δ
app/api/helpers/payment.py	25% <0%> (-0.18%)	⬇️

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[anhanh11001]

Got that working for me