3405952 - Swagger input parameter definition for HTML Form in Open API 3 - SAP Commerce Cloud

@RequestMapping(
    value = "/token",
    method = RequestMethod.POST,
    consumes = { MediaType.APPLICATION_FORM_URLENCODED_VALUE }
)
@ResponseBody
@ApiOperation(
    value = "Gets oauth access token.",
    notes = "Gets oauth access token."
)
@ApiImplicitParams(
    {
        @ApiImplicitParam(
            name = "grant_type",
            value = "grant type",
            required = true,
            dataType = "string",
            paramType = "form"
        ),
        @ApiImplicitParam(
            name = "client_secret",
            value = "client secret.",
            required = true,
            dataType = "string",
            paramType = "form"
        ),
        @ApiImplicitParam(
            name = "client_id",
            value = "client id.",
            required = true,
            dataType = "string",
            paramType = "form"
        ),
        @ApiImplicitParam(
            name = "username",
            value = "username.",
            required = true,
            dataType = "string",
            paramType = "form"
        ),
        @ApiImplicitParam(
            name = "password",
            value = "password.",
            required = true,
            dataType = "string",
            paramType = "form"
        )
    }
)
@ApiBaseSiteIdParam
public ResponseEntity<OAuth2AccessTokenWsDTO> punchoutLevel2Auth(
    @ApiParam(hidden = true)
    @RequestParam final MultiValueMap<String, String> parameters
) throws HttpRequestMethodNotSupportedException {
    ...
}