Did the other statements look right to you?
How about the other actions I took? Did the syntax look fine on the $WA_fieldValuesStr statement in the segment relating to PromoCode variable value for insertion into the db? I'm wondering if I should have used $_Post[PromoCode]since that's all of the other segments of the string use it. I'm unsure if that's my problem. If the syntax is fine, then my issue is elsewhere.