PASAR API

🇬🇧 HMRC ~ Developer Hub (Making Tax Digital APIs)

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Free but requires creating a developer application; most APIs use OAuth 2.0 (user-restricted or application-restricted) and a sandbox; includes Making Tax Digital for VAT and Income Tax, plus PAYE and more.

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# HMRC ~ Developer Hub (Making Tax Digital APIs) needs OAuth credentials ~ get yours at:
# https://developer.service.hmrc.gov.uk/api-documentation
curl 'https://api.service.hmrc.gov.uk/' \
  -H 'Authorization: Bearer YOUR_TOKEN'

AI prompt

I'm integrating a United Kingdom API into my app.

API: HMRC ~ Developer Hub (Making Tax Digital APIs)
Provider: HM Revenue & Customs
Auth: requires OAuth credentials (sign up: https://developer.service.hmrc.gov.uk/api-documentation)
Pricing: free
Base URL: https://api.service.hmrc.gov.uk/
Important note: Free but requires creating a developer application; most APIs use OAuth 2.0 (user-restricted or application-restricted) and a sandbox; includes Making Tax Digital for VAT and Income Tax, plus PAYE and more.

Source: HM Revenue & Customs (https://developer.service.hmrc.gov.uk/api-documentation)
Source type: Official portal or provider docs
Endpoint type: Portal or multi-endpoint API
Integration difficulty: Regulated setup
Last checked: 2026-07-05
Production caveat: Onboarding, approvals, sandbox/preprod, or compliance steps may be required before production.

Help me set up the correct onboarding/authentication path and make the first valid request ~ explain exactly where credentials go and what must happen before production.

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