An interface structure (5, 105, 205, 405, 505A, 505B, 505C, 505D, 505E, 605A, 605B, 605C, 605D, 605E, 605F, 605G, 705A, 705B, 705C, 705D, 805) connectable to a separate liquid reservoir (33, 133, 133A, 433, 733C, 833) of a bag-in-box print supply, to connect that liquid reservoir to a receiving station, comprising a first, second and third dimension at straight angles with each other, a liquid interface (15, 115, 515A, 515B, 515C, 515D, 615A, 615C, 615E, 615F, 715A, 815A, 815B) to fluidically connect to at least one liquid needle of the receiving station, including an interface edge (116, 716D) and a seal (20, 120), a liquid channel (17, 21, 117, 517C1, 517C2, 617D, 617G, 817A, 817B), along the second dimension, to fluidically connect the liquid interface to the reservoir, the liquid channel and interface defining a needle insertion direction along the second dimension, a support wall (113, 137, 137A, 191c, 637E, 637Ea1) supporting an integrated circuit laterally next to the liquid channel, the integrated circuit (174, 674, 674B) including contact pad (175, 675A, 675C, 675E, 675, 875) contact surfaces extending approximately in a first virtual reference plane parallel to the second and third dimensions (d2, d3) and along a line parallel to the third dimension, the first virtual reference plane extending at a distance from a second virtual reference plane parallel the second and third interface dimensions, the second virtual reference plane intersecting the liquid channel and liquid interface, the contact surfaces facing the second virtual reference plane, and characterised in that the the interface structure further comprises a front push area (154A, 154B, 654Ab) adjacent the liquid interface at the opposite side of the liquid interface with respect to the first virtual reference plane, the front push area terminating at a front edge that defines a profile height of the interface structure, between said front edge and an opposite distal edge adjacent the first virtual reference plane; and a secure feature (157, 757A) to facilitate securing the apparatus to a receiving station. a first, second and third dimension at straight angles with each other, a liquid interface (15, 115, 515A, 515B, 515C, 515D, 615A, 615C, 615E, 615F, 715A, 815A, 815B) to fluidically connect to at least one liquid needle of the receiving station, including an interface edge (116, 716D) and a seal (20, 120), a liquid channel (17, 21, 117, 517C1, 517C2, 617D, 617G, 817A, 817B), along the second dimension, to fluidically connect the liquid interface to the reservoir, the liquid channel and interface defining a needle insertion direction along the second dimension, a support wall (113, 137, 137A, 191c, 637E, 637Ea1) supporting an integrated circuit laterally next to the liquid channel, the integrated circuit (174, 674, 674B) including contact pad (175, 675A, 675C, 675E, 675, 875) contact surfaces extending approximately in a first virtual reference plane parallel to the second and third dimensions (d2, d3) and along a line parallel to the third dimension, the first virtual reference plane extending at a distance from a second virtual reference plane parallel the second and third interface dimensions, the second virtual reference plane intersecting the liquid channel and liquid interface, the contact surfaces facing the second virtual reference plane, and characterised in that the the interface structure further comprises a front push area (154A, 154B, 654Ab) adjacent the liquid interface at the opposite side of the liquid interface with respect to the first virtual reference plane, the front push area terminating at a front edge that defines a profile height of the interface structure, between said front edge and an opposite distal edge adjacent the first virtual reference plane; and a support wall (113, 137, 137A, 191c, 637E, 637Ea1) supporting an integrated circuit laterally next to the liquid channel, the integrated circuit (174, 674, 674B) including contact pad (175, 675A, 675C, 675E, 675, 875) contact surfaces extending approximately in a first virtual reference plane parallel to the second and third dimensions (d2, d3) and along a line parallel to the third dimension, the first virtual reference plane extending at a distance from a second virtual reference plane parallel the second and third interface dimensions, the second virtual reference plane intersecting the liquid channel and liquid interface, the contact surfaces facing the second virtual reference plane, and characterised in that the the interface structure further comprises a front push area (154A, 154B, 654Ab) adjacent the liquid interface at the opposite side of the liquid interface with respect to the first virtual reference plane, the front push area terminating at a front edge that defines a profile height of the interface structure, between said front edge and an opposite distal edge adjacent the first virtual reference plane; a secure feature (157, 757A) to facilitate securing the apparatus to a receiving station.