Changes to Initialize transaction

added the new required request property chargeType

added the new required request property expiresAt

the request property channels became required

the request property feeBearer became required

the request property firstName became required

the request property lastName became required

the request property metadata became required

the request property phoneNumber became required

the request property redirectUrl became required

the request property reference became required

the request property taxChargeable became required

the endpoint scheme security ApiKeyAuth was added to the API

the email request property format was generalized from email to no format

added SuccessResponseDto subschema #2 to the response body allOf list for the response status 201

removed GenericResponse from the response body allOf list for the response status 201

added the non-success response with the status 400

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 422

added the non-success response with the status 500