CreditCheckerProcess.cs

public class Functions
{
    private readonly ICreditCheckFilter creditCheckFilter;
    private readonly IPipe<EnrichedLoanRequest> pipe;

    public Functions(
        ICreditCheckFilter creditCheckFilter,
        IPipe<EnrichedLoanRequest> pipe)
    {
        this.creditCheckFilter = creditCheckFilter;
        this.pipe = pipe;
    }

    public async Task ProcessQueueMessage(
        [QueueTrigger("submitted-loan-requests")] string loanRequestPayload,
        TextWriter log)
    {        
        var submittedLoanRequest = JsonConvert
            .DeserializeObject<LoanRequest>(
            loanRequestPayload);        
        var enrichedLoanRequest = await creditCheckFilter
            .PerformCreditCheck(submittedLoanRequest);        
        await pipe.Write(enrichedLoanRequest);      
    }
}