#161660074 Refactor Code to Improve During Consuming

[KMaina]

What does this PR do?

Improve the API to enhance the user experience

Description of Task to be completed?

Have more descriptive error codes

How should this be manually tested?

• Clone the repo locally
• Create virtual environment and run pytest
• In Postman supply invalid values and have the key of those error messages being error
• In Postman supply valid values and have the key of those success messages being success

Any background context you want to provide?

None

What are the relevant pivotal tracker stories?

#161660074

[coveralls]

Pull Request Test Coverage Report for Build 129

• 17 of 39 (43.59%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 89.495%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/api/v2/resource/models/model_users.py	5	11	45.45%
app/api/v2/resource/models/model_sales.py	4	11	36.36%
app/api/v2/resource/models/model_products.py	8	17	47.06%

Totals
Change from base Build 125:	0.1%
Covered Lines:	1099
Relevant Lines:	1228

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💛 - Coveralls