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REST APIs for wallets, card issuing, payment acceptance, identity verification, and PSD2 open banking — secured by OAuth 2.0 and request signing, with consistent JSON envelopes and webhooks across products.

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# Fetch an access token via the OAuth 2.0 Client Credentials grant
curl -X POST 'https://{host}/openapi/auth/oauth2/token' \
  -H 'Content-Type: multipart/form-data' \
  -F 'client_id=YOUR_API_KEY' \
  -F 'client_secret=YOUR_API_SECRET' \
  -F 'grant_type=client_credentials'

# Sample response
# {
#   "access_token":  "CkppLkyiqEUKITGdtCZRUZBl",
#   "expires_in":    21600,
#   "refresh_token": "CpCAhcCRtLU4kPjs54omWW3A",
#   "rt_expires_in": 43200,
#   "token_type":    "bearer"
# }