curl -X POST https://staging-switch.yourflexpay.com/api/v1/applications \
  -H 'Content-Type: application/json' \
  -d '{
    "name": "WalletApp",
    "appHandle": "walletapp",
    "transactionWebhookUrl": "https://wallet-app.example.com/switch/webhook"
  }'

curl -X POST https://staging-switch.yourflexpay.com/api/v1/auth/token \
  -H 'Content-Type: application/json' \
  -d '{
    "client_id": "<clientId>",
    "client_secret": "<clientSecret>"
  }'

Authorization: Bearer <token>

curl -X POST https://staging-switch.yourflexpay.com/api/v1/subjects \
  -H 'Authorization: Bearer <token>' \
  -H 'Content-Type: application/json' \
  -d '{
    "externalId": "user-123",
    "displayName": "Alice Doe"
  }'

curl -X POST https://staging-switch.yourflexpay.com/api/v1/tags \
  -H 'Authorization: Bearer <token>' \
  -H 'Content-Type: application/json' \
  -d '{
    "subjectId": "<subject-id>",
    "tagString": "alice"
  }'

curl -X POST https://staging-switch.yourflexpay.com/api/v1/transactions \
  -H 'Authorization: Bearer <token>' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: txn-001' \
  -d '{
    "senderTag": "alice@walletapp",
    "receiverTag": "bob@shopapp",
    "amount": 500,
    "currency": "NGN",
    "callbackUrl": "https://wallet-app.example.com/switch/callback"
  }'