fix: send Connector as reference for base_url (#200)
Files to modify:


**aci.rs**
  Modify existing code

**adyen.rs**
  Modify existing code

**applepay.rs**
  Modify existing code

**authorizedotnet.rs**
  Modify existing code

**braintree.rs**
  Modify existing code

**checkout.rs**
  Modify existing code

**klarna.rs**
  Modify existing code

**stripe.rs**
  Modify existing code

**api.rs**
  Modify existing code

**api.rs**
  Modify existing code