Payment api url is fixed

[Navinkumar math (navin-math)]

Description

Payment request is not getting executed as wrong payment api request url is set in the python SDK and fix is made to correct this payment api request url. After this fix, user can make payment without any issue.

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[curtisfennerpaypay]

The failing test needs to be fixed still

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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