[$100] Use billing account for payments

[maxceem]

At the moment we are processing all the payments using the default billing account. We would like to use a billing account which we would set for Resource Booking.

• Add billingAccountId field to the ResourceBooking model. We should be able to set/update/get it using ResourceBooking endpoints. billingAccountId is an optional fields type bigint.
• Add billingAccountId filed to the WorkPeriodPayment model. We should NOT be able to set/update it using any endpoint.
  • when we are creating a new payment WorkPeriodPayment record, we also processing an actual payment using the method createPayment https://github.com/topcoder-platform/taas-apis/blob/dev/src/services/WorkPeriodPaymentService.js#L99-L105.
  • before creating a payment get the billingAccountId form the corresponding ResourceBooking
  • if Resource Booking doesn't have billing account set, throw error Billing account is not assigned to the resource booking. We should not be able to create WorkPeriodPayment and process the payment without billing account set for the Resource Booking.
  • if the billing account is there, then:
    • pass billingAccountId to the createPayment method, and make sure that is pass it to the challenge it creates here https://github.com/topcoder-platform/taas-apis/blob/dev/src/services/PaymentService.js#L83
  • when creating workPeriodPayment records, set the billing account id which we used to workPeriodPayment.billingAccountId for to track the history
• As we update model make sure that we update all documentation and utils as per https://github.com/topcoder-platform/taas-apis#documentation-and-utils

Unit tests

Create unit test which would check that without billing account set for resource booking we get error. And if the billing account is set then work period payment is created correctly with the billing account set.

[maxceem]

Challenge https://www.topcoder.com/challenges/1a7d6313-2741-47c2-81f0-49fb4ee1048f has been created for this ticket.

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[maxceem]

@imcaizheng this is ready for pickup now.

[maxceem]

Challenge https://www.topcoder.com/challenges/1a7d6313-2741-47c2-81f0-49fb4ee1048f has been assigned to aaron2017.

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[imcaizheng]

@maxceem Should we allow set/update/get billingAccountId or just allow set/get actions?