fix(core): Add Validation Check for Amount in Capture Flow (#9434)

Co-authored-by: Anurag Singh <anurag.singh.001@MacBookPro.lan>
Co-authored-by: Anurag Singh <anurag.singh.001@Anurag-Singh-WPMHJ5619X.local>
Files to modify:


**connector.rs**
  Modify existing code

**helpers.rs**
  Modify existing code