Changes to Get all merchants

the error/code response's property type changed from string to no type for status 400

removed the optional property error/errors from the response with the 400 status

added the new optional query request parameter partner_id

added the optional property data/items/country to the response with the 200 status

added the optional property data/items/settlement_currency to the response with the 200 status

added the optional property error/metadata to the response with the 400 status

added subschema #1 subschema #2 to the error/code response property allOf list for the response status 400

added the required property data/items/has_client_secret to the response with the 200 status

added the required property data/items/refund_retention_rate to the response with the 200 status

endpoint added

api path removed without deprecation