API vs OData for Cloud BC

Hi @Juhl
thanks for the reply.
I just created a page to be used as OData, and i created the button (function)
it works fine.

but once I changed the page type become API , then it's gone.
does it mean i need to separate become 2 pages?
1 for API... and 1 for BC user?

Hi @Juhl
thanks for your answer.
I just created 1 page, it works fine for OData
I tested using postman
RVB21-000005 --> Document No.
ApplyToDocument --> Page Name
ApplyInvoiceToReceipt --> Function Name

[ServiceEnabled]
    procedure ApplyInvoiceToReceipt(var actionContext: WebServiceActionContext)
    var
        WSCodeunit: Codeunit "WS Codeunit";
    begin
        WSCodeunit.ApplyInvoiceToReceipt(Rec."Document No.");
        actionContext.SetObjectType(ObjectType::Page);
        actionContext.SetObjectId(Page::"Apply To Document");
        actionContext.AddEntityKey(Rec.FieldNo("Document No."), Rec."Document No.");
        actionContext.SetResultCode(WebServiceActionResultCode::Created);
    end;[/s]

1. OData
https://api.businesscentral.dynamics.com/v2.0/Sandbox/ODataV4/Company('Training Company')/ApplyToDocument('RVB21-000005')/NAV.ApplyInvoiceToReceipt
--> Successful

2. API
https://api.businesscentral.dynamics.com/sandbox/api/PublisherName/PublisherGroup/v2.0/Companies(d4f3c1fa-d7cc-eb11-9f0a-000d3ac7683d)/ApplyToDocument('RVB21-000005')/NAV.ApplyInvoiceToReceipt
--> Failed

{
    "error": {
        "code": "RequestDataInvalid",
        "message": "Request data is invalid."
    }
}

any idea whats wrong with my API?

ok noted.
seems like OData is more efficient.
i need to develop for both BC user and API