curl --request POST \
  --url https://api.iotools.cloud/v1/tool/complex-numbers-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "operation": "add",
  "real1": "3",
  "imag1": "4",
  "real2": "1",
  "imag2": "2"
}
'

{
  "tool": "complex-numbers-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "result": "4 + 6i",
    "modulus": "7.2111",
    "conjugate": "4 - 6i",
    "polar": "7.2111(cos 56.3099° + i sin 56.3099°)",
    "steps": "Add (z₁ + z₂)\nz₁ = 3 + 4i, z₂ = 1 + 2i\nz₁ + z₂ = (3 + 1) + (4 + 2)i = 4 + 6i"
  },
  "credits_used": 5,
  "credits_remaining": null
}