> ## Documentation Index > Fetch the complete documentation index at: https://docs.maesn.com/llms.txt > Use this file to discover all available pages before exploring further. # Patch customer ## Field support per integration If you're not using the [Interactive Authentication Flow](/authentication#interactive-authentication-flow), make sure the query parameters `environmentName` and `companyId` are correctly populated. You can obtain these values by using the `GET Environments` and `GET Companies` endpoints available under the Authentication section. Supported Request Parameters: Available options: `CONTACT_PERSON`, `COMPANY` Available options (ISO 3166-1 alpha-2): `AD`, `AE`, `AF`, `AG`, `AI`, `AL`, `AM`, `AO`, `AQ`, `AR`, `AS`, `AT`, `AU`, `AW`, `AX`, `AZ`, `BA`, `BB`, `BD`, `BE`, `BF`, `BG`, `BH`, `BI`, `BJ`, `BL`, `BM`, `BN`, `BO`, `BQ`, `BR`, `BS`, `BT`, `BV`, `BW`, `BY`, `BZ`, `CA`, `CC`, `CD`, `CF`, `CG`, `CH`, `CI`, `CK`, `CL`, `CM`, `CN`, `CO`, `CR`, `CU`, `CV`, `CW`, `CX`, `CY`, `CZ`, `DE`, `DJ`, `DK`, `DM`, `DO`, `DZ`, `EC`, `EE`, `EG`, `EH`, `ER`, `ES`, `ET`, `FI`, `FJ`, `FK`, `FM`, `FO`, `FR`, `GA`, `GB`, `GD`, `GE`, `GF`, `GG`, `GH`, `GI`, `GL`, `GM`, `GN`, `GP`, `GQ`, `GR`, `GS`, `GT`, `GU`, `GW`, `GY`, `HK`, `HM`, `HN`, `HR`, `HT`, `HU`, `ID`, `IE`, `IL`, `IM`, `IN`, `IO`, `IQ`, `IR`, `IS`, `IT`, `JE`, `JM`, `JO`, `JP`, `KE`, `KG`, `KH`, `KI`, `KM`, `KN`, `KP`, `KR`, `KW`, `KY`, `KZ`, `LA`, `LB`, `LC`, `LI`, `LK`, `LR`, `LS`, `LT`, `LU`, `LV`, `LY`, `MA`, `MC`, `MD`, `ME`, `MF`, `MG`, `MH`, `MK`, `ML`, `MM`, `MN`, `MO`, `MP`, `MQ`, `MR`, `MS`, `MT`, `MU`, `MV`, `MW`, `MX`, `MY`, `MZ`, `NA`, `NC`, `NE`, `NF`, `NG`, `NI`, `NL`, `NO`, `NP`, `NR`, `NU`, `NZ`, `OM`, `PA`, `PE`, `PF`, `PG`, `PH`, `PK`, `PL`, `PM`, `PN`, `PR`, `PT`, `PW`, `PY`, `QA`, `RE`, `RO`, `RS`, `RU`, `RW`, `SA`, `SB`, `SC`, `SD`, `SE`, `SG`, `SH`, `SI`, `SJ`, `SK`, `SL`, `SM`, `SN`, `SO`, `SR`, `SS`, `ST`, `SV`, `SX`, `SY`, `SZ`, `TC`, `TD`, `TF`, `TG`, `TH`, `TJ`, `TK`, `TL`, `TM`, `TN`, `TO`, `TR`, `TT`, `TV`, `TW`, `TZ`, `UA`, `UG`, `UM`, `US`, `UY`, `UZ`, `VA`, `VC`, `VE`, `VG`, `VI`, `VN`, `VU`, `WF`, `WS`, `YE`, `YT`, `ZA`, `ZM`, `ZW` Available options: `BILLING` Available options: `BUSINESS` Available options: `BUSINESS` ## OpenAPI ````yaml patch /accounting/customers/{contactId} openapi: 3.0.0 info: title: Maesn unified API description: The Maesn unified API description version: '1.0' contact: {} servers: - url: https://api.maesn.dev security: [] tags: - name: maesn description: '' paths: /accounting/customers/{contactId}: patch: tags: - accounting operationId: patchCustomers parameters: - name: contactId required: true in: path schema: type: string - name: companyId required: false in: query schema: type: string - name: environmentName in: query schema: type: string required: false - name: X-API-KEY description: API key in: header schema: type: string required: true - name: X-ACCOUNT-KEY description: Account key in: header schema: type: string required: true requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateContactRequestDto' responses: '200': description: '' content: application/json: schema: allOf: - $ref: '#/components/schemas/BaseResponseDto' - properties: data: $ref: '#/components/schemas/ContactResponseDto' type: object components: schemas: CreateContactRequestDto: type: object properties: addresses: type: array items: $ref: '#/components/schemas/ContactAddress' bankAccount: $ref: '#/components/schemas/BankAccount' companyName: type: string example: maesn contactType: type: string enum: - CONTACT_PERSON - COMPANY - UNDEFINED example: CONTACT_PERSON contactPersons: type: array items: $ref: '#/components/schemas/ContactPersonRequest' documentId: type: string example: Z1248601M emailAddresses: type: array items: $ref: '#/components/schemas/ContactEmail' number: type: string example: '1042' phoneNumbers: type: array items: $ref: '#/components/schemas/ContactPhone' projectId: type: string example: '3' vatId: type: string example: DE123456789 BaseResponseDto: type: object properties: meta: $ref: '#/components/schemas/MetaResponse' data: oneOf: - type: object - type: array ContactResponseDto: type: object properties: id: type: string example: 92c4f3a2-5b8e-4d1b-8a0c-9f6e7d2f3e4b addresses: type: array items: $ref: '#/components/schemas/ContactAddress' companyName: type: string example: maesn contactType: type: string enum: - CONTACT_PERSON - COMPANY example: CONTACT_PERSON contactPersons: type: array items: $ref: '#/components/schemas/ContactPerson' documentId: type: string example: Z1248601M emailAddresses: type: array items: $ref: '#/components/schemas/ContactEmail' number: type: string example: '1042' phoneNumbers: type: array items: $ref: '#/components/schemas/ContactPhone' projectId: type: string example: '3' updatedDate: type: string example: '2018-01-01T13:00:00.000Z' vatId: type: string example: DE123456789 ContactAddress: type: object properties: addressLine1: type: string example: Lucky street 1 addressLine2: type: string example: 2nd floor city: type: string example: Berlin countryCode: type: string enum: - AD - AE - AF - AG - AI - AL - AM - AO - AQ - AR - AS - AT - AU - AW - AX - AZ - BA - BB - BD - BE - BF - BG - BH - BI - BJ - BL - BM - BN - BO - BQ - BR - BS - BT - BV - BW - BY - BZ - CA - CC - CD - CF - CG - CH - CI - CK - CL - CM - CN - CO - CR - CU - CV - CW - CX - CY - CZ - DE - DJ - DK - DM - DO - DZ - EC - EE - EG - EH - ER - ES - ET - FI - FJ - FK - FM - FO - FR - GA - GB - GD - GE - GF - GG - GH - GI - GL - GM - GN - GP - GQ - GR - GS - GT - GU - GW - GY - HK - HM - HN - HR - HT - HU - ID - IE - IL - IM - IN - IO - IQ - IR - IS - IT - JE - JM - JO - JP - KE - KG - KH - KI - KM - KN - KP - KR - KW - KY - KZ - LA - LB - LC - LI - LK - LR - LS - LT - LU - LV - LY - MA - MC - MD - ME - MF - MG - MH - MK - ML - MM - MN - MO - MP - MQ - MR - MS - MT - MU - MV - MW - MX - MY - MZ - NA - NC - NE - NF - NG - NI - NL - 'NO' - NP - NR - NU - NZ - OM - PA - PE - PF - PG - PH - PK - PL - PM - PN - PR - PT - PW - PY - QA - RE - RO - RS - RU - RW - SA - SB - SC - SD - SE - SG - SH - SI - SJ - SK - SL - SM - SN - SO - SR - SS - ST - SV - SX - SY - SZ - TC - TD - TF - TG - TH - TJ - TK - TL - TM - TN - TO - TR - TT - TV - TW - TZ - UA - UG - UM - US - UY - UZ - VA - VC - VE - VG - VI - VN - VU - WF - WS - YE - YT - ZA - ZM - ZW example: DE postalCode: type: string example: '10243' type: type: string enum: - BILLING - DELIVERY - EMPTY - PRIVATE - WORK - PICKUP example: BILLING BankAccount: type: object properties: bic: type: string example: COBADEFFXXX holder: type: string example: John Doe iban: type: string example: DE89370400440532013000 isMainAccount: type: boolean example: true name: type: string example: Sparkasse sepa: type: boolean example: true required: - iban - bic - holder - sepa ContactPersonRequest: type: object properties: emailAddresses: type: array items: $ref: '#/components/schemas/ContactEmail' firstName: type: string example: John lastName: type: string example: Doe phoneNumbers: type: array items: $ref: '#/components/schemas/ContactPhone' salutation: type: string example: Mr ContactEmail: type: object properties: email: type: string example: john.doe@company.com type: type: string enum: - BUSINESS - PRIVATE - OFFICE - INVOICE - PAYMENT - OTHER example: BUSINESS ContactPhone: type: object properties: number: type: string example: +49 7163307056 type: type: string enum: - BUSINESS - MOBILE - FAX - LANDLINE - OFFICE - OTHER - PRIVATE - SKYPE - WHATSAPP example: MOBILE MetaResponse: type: object properties: warnings: type: array items: type: string example: Field not used by target system pagination: $ref: '#/components/schemas/PaginationResponse' ContactPerson: type: object properties: emailAddresses: type: array items: $ref: '#/components/schemas/ContactEmail' firstName: type: string example: John lastName: type: string example: Doe phoneNumbers: type: array items: $ref: '#/components/schemas/ContactPhone' salutation: type: string example: Mr PaginationResponse: type: object properties: total: type: number example: 125 perPage: type: number example: 50 currentPage: type: number example: 1 totalPages: type: number example: 3 ````