https://skmtc.net/hmrc/apis/self-assessment-assist/docs/individuals/self-assessment/assist/reports/:nino/:taxYear/:calculationId/post 2026-07-13 0.5 https://skmtc.net/hmrc/apis/self-assessment-assist/docs/individuals/self-assessment/assist/reports/acknowledge/:nino/:reportId/:correlationId/post 2026-07-13 0.5