What can I use to still get the data from D365 to the JSON I have for this program?

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C#

API

I have an API that I am working on with a package installed that has a library with CrmEntity and D365Field. I have never worked with API in C# before. I have to remove everything in the package and convert the current code to still run the same. Need help on where to start or how it should look. If I remove CrmEntity and D365Field, What can I use to still get the data from D365 to the JSON I have for this program?

<pre>using OneDigital.WebApi.HttpClient.Lib.D365Entity;
using OneDigital.WebApiHttpClient.Models;

namespace BenchMarkingAPITab.Models
{
    public class Company : CrmEntity
    {
        public override string D365EntityName => "account";

        [D365Field(name: "accountid")]
        public override Guid CrmId { get; set; }

        [D365Field(name: "name")]
        public string? CompanyName { get; set; }

        [D365Field(name: "parentaccountid", isForeignKey: true, dataBindEntity: "account")]
        public Guid? ParentAccountId { get; set; }

        [D365Field(name: "parentaccountid", isForeignKey: true, dataBindEntity: "account", useFormattedValue: true)]
        public string? ParentAccountName { get; set; }

        [D365Field(name: "digins_companytype")]
        public int CompanyTypeId { get; set; }

        [D365Field(name: "digins_companytype", useFormattedValue: true)]
        public string? CompanyTypeName { get; set; }

        [D365Field(name: "digins_effectivedate")]
        public DateTime? EffectiveDate { get; set; }

        [D365Field(name: "NumberOfEmployees")]
        public int NumberOfEmployees { get; set; }

        [D365Field(name: "digins_stateid", useFormattedValue: true, dataBindEntity: "digins_stateid")]
        public Guid? StateName { get; set; }

        [D365Field(name: "digins_stateid", useFormattedValue: true)]
        public string? State { get; set; }

        [D365Field(name: "digins_industryid", isForeignKey: true, dataBindEntity: "digins_industry", fieldSchemaName: "digins_IndustryId")]
        public Guid? Industry { get; set; }

        [D365Field(name: "digins_sic", isForeignKey: true, dataBindEntity: "SIC/NAICS Code", useFormattedValue: true)]
        public int IndustryCode { get; set; }

        [D365Field(name: "adx_partner_status", useFormattedValue: true)]
        public string? Partner { get; set; }

        [D365Field(name: "OwnerId", useFormattedValue: true)]
        public string? OwnerId { get; set; }

        [D365Field(name: "AccountCategoryCode")]
        public string? Category { get; set; }
    }

    public class User : CrmEntity
    {
        public override string D365EntityName => "systemuser";

        [D365Field(name: "systemuserid")]
        public override Guid CrmId { get; set; }

        [D365Field(name: "DomainName")]
        public string? UserName { get; set; }

    }

    public class Product : CrmEntity
    {
        public override string D365EntityName => "digins_product";

        [D365Field(name: "digins_productid")]
        public override Guid CrmId { get; set; }

        [D365Field(name: "digins_ProductName")]
        public string? ProductName { get; set; }

        [D365Field(name: "digins_producttype")]
        public string? ProductType { get; set;}

        [D365Field(name: "digins_productplantype")]
        public string? ProductPlanType { get; set; }

    }

    public class PlanDetail : CrmEntity
    {
        public override string D365EntityName => "digins_plandetail";

        [D365Field(name: "digins_plandetalid")]
        public override Guid CrmId { get; set; }

        [D365Field(name: "digins_name")]
        public string? name { get; set; }

        [D365Field(name: "digins_innetwork")]
        public string? Innetwork { get; set; }

        [D365Field(name: "AccountCategoryCode")]
        public string? Category { get; set; }

    }

    public class PlanRate : CrmEntity
    {
        public override string D365EntityName => "digins_planrate";

        [D365Field(name: "digins_planrateid")]
        public override Guid CrmId { get; set; }

        [D365Field(name: "digins_tiertype")]
        public string? TierType { get; set; }

        [D365Field(name: "digins_ratetype")]
        public string? RateType { get; set; }

        [D365Field(name: "TransactionCurrencyId")]
        public int TransactionCurrencyId { get; set; }

        [D365Field(name: "digins_employeerate_money")]
        public int EmployeeRateMoney { get; set; }

        [D365Field(name: "digins_employerrate_money")]
        public int EmployerateMoney { get; set; }

        [D365Field(name: "digins_employeerate_percent")]
        public int EmployeeRatePercent { get; set; }

        [D365Field(name: "digins_employerrate_percent")]
        public int EmployerRatePercent { get; set; }

        [D365Field(name: "digins_contributionunit")]
        public int ContributionUnite { get; set; }

        [D365Field(name: "digins_monthlypremium")]
        public int MonthlyPremium { get; set; }


    }
}

What I have tried:

I have tried to remove the package.