Enhanced drug pricing endpoint that returns customer-facing support details,
terms and conditions URLs, and marketing names for each pricing partner.
Partner credentials are not included in V2 responses.

Differences from V1 (/marketplace/drug-pricing-partner):

• Drug response omits: Name, SeoName, IsLegalEligible, IsControlledSubstance
• Pharmacy response omits: Distance, Latitude, Longitude
• Price entries use PricingPartner / PricingPartnerLogo (not PBAClientName / PBAClientLogo)
• Price entries add: CustomerSupportNumber, CustomerSupportEmail, PartnerTermsAndConditionsUrl, PartnerMarketingName
• Price entries omit: PartnerUser, PartnerPassword, FormattedPrice

Use PricingPartner as the pricingPartner value when calling the coupon endpoints.

V2-specific 400 errors:

• NDC with wrong digit count returns "No Medispan drug could be found for NDC \"<value>\"." (plain string, not JSON object)
• Negative Quantity returns "Quantity is a required field in the request" (plain string)