curl --request GET \
  --url 'https://{domain}/api/v2/network/aff-billing/payment-methods/{affiliate_id}?api-key='

{
  "status": "success",
  "code": 200,
  "name": "OK",
  "message": "<string>",
  "info": {
    "payment_methods": [
      {
        "id": 123,
        "payment_method_type": "<string>",
        "details": {},
        "is_primary": true,
        "supported_currencies": [
          "<string>"
        ]
      }
    ]
  }
}