Changes to Get a billing profile

added the optional property workflow/allOf[#/components/schemas/BillingWorkflow]/invoicing/allOf[subschema #1: Workflow invoice settings]/subscription_end_proration_mode to the response with the 200 status

api tag OpenMeter Billing Settings added

api tag OpenMeter Billing removed

added TaxCodeReference to the workflow/allOf[#/components/schemas/BillingWorkflow]/tax/allOf[subschema #1: Workflow tax settings]/default_tax_config/allOf[#/components/schemas/BillingTaxConfig]/tax_code response property allOf list for the response status 200

removed BillingTaxCodeReference from the workflow/allOf[#/components/schemas/BillingWorkflow]/tax/allOf[subschema #1: Workflow tax settings]/default_tax_config/allOf[#/components/schemas/BillingTaxConfig]/tax_code response property allOf list for the response status 200

removed the optional property workflow/allOf[#/components/schemas/BillingWorkflow]/invoicing/allOf[subschema #1: Workflow invoice settings]/subscription_end_proration_mode from the response with the 200 status

api tag OpenMeter Billing added

api tag OpenMeter Billing Settings removed

added BillingTaxCodeReference to the workflow/allOf[#/components/schemas/BillingWorkflow]/tax/allOf[subschema #1: Workflow tax settings]/default_tax_config/allOf[#/components/schemas/BillingTaxConfig]/tax_code response property allOf list for the response status 200

removed TaxCodeReference from the workflow/allOf[#/components/schemas/BillingWorkflow]/tax/allOf[subschema #1: Workflow tax settings]/default_tax_config/allOf[#/components/schemas/BillingTaxConfig]/tax_code response property allOf list for the response status 200